>*<<*<* for checking the firmware revision information (software release)

>*<<*<*> 1-row text strings. if pressing yes you can check
the phones text programming in currently selected language. (298 entries)

>*<<*<*>> n-row text strings. if pressing yes you can check
the phones text programming in currently selected language. (160 entries?)

The phone should display something similar to this:

CXC125065          - Cell phone's internalproduct code. 
 PRG                        - Firmware revision - software version (date & time stamp).
 970715 1515              

LASTEST  Version is: <971128>
Fixes: ???

Software update, how?

I have been asked a lot about how to update the software in cellular phones.
The easiest thing to do is to go to the nearest Ericsson
dealer and make him do it for you. Just remember that it is supposed to
be free (a receipt is requiet) so don't let him tell you anything else!

The Service Provider (SP) Lock menu is used to lock the cell phone to the
SP's SIM card. Once the cell phone is locked to a specific operator, if one
inserts a SIM card from a different operator the phone will refuse to accept it!
The cell phone will however accept another SIM card from the same operator.

To activate/deactivate this lock one needs a special secret code that is not
available to the end user. (not even to you... or is it ? in case please let me know!)

Here is how to activate the menu:

<**< Lock to Network? if pressing yes you have 5 attempts
to enter NCK.

<**<< Lock to Network subset? if pressing yes you have
5 attempts to enter NSCK.

Warning: Your phone can be locked to a service provider FOREVER by doing this!
If an invalid code is entered all five times, the menu will exit and be deactivated!
Any further attempt to activate the NCK/NSCK lock Menu will result in the response
"Not allowed"! However the NCK/NSCK lock can be recover through a direct clearing
in the EEPROM.

Bat. level indicator when turned OFF...
When the gh688 is turned off and the phone is not changing -
the bat. level can be seen for a short period of time by pressing
the 'NO' key quick once (it has to be quick!) and then wait for
about 2 sec. The bat. level will now be shown in the display
at its normal position.

Access menu without Sim card ...
To access to the menu in your phone without having a card inside do the following:
type **04*0000*0000*0000# When display say "Wrong Pin" press NO and you have access to the all menus: Info, Access, Settings, Calculator, Clock, Keylock On?, Mail, Phone book.
NOTE if you try this on the GH688 your phone may stop at Keylock On? menu and you´ll have to take your battery out to turn the phone on again.

Free phone calls using the GF788..

NB! This trick has only been reported working on PREPAID GSM CARDS
and in some countries and with some sw versions.

The prepaid GSM SIM CARD is a kind of "SIM card" which only has a sertant
amount of credit on it (like a normal phonebox telecard)...
if it can be traced? - I don't know...

Well..here's the trick you dial the no. normally and press YES. While "connecting"
is shown on the screen, the following procedure should be carried out:
Press CLR then 0 then # and then NO (twice) so as to switch OFF the phone.
You can then still speak on the phone while it is switched off but the
SIM card does not record your calls which will lead to FREE
phone calls in some countries.. we hope!!

Another variant of the code ..
Make a Call, while the phone says Connecting type 083# (the position 83 must be empty! ), when phone says Pos Emtpy, press the NO key and turn off the phone. (Thanks goes to Vanya Pupkin)

If you can make the call with the phone turned off you will face a problem when
you need to hang up the phone...the only way for you to do that is remove the
battery...??? (Please tell me otherwise!!)

Bottom view, keyboard up, counting from the left:

01 Out Audio from Mobile Station
02 In Audio to Mobile Station
03 In External Analog Audio Accessory Sense. Connect to GND to enable external mike and speaker
04 - Audio Signal Ground, 0V reference
05 In Portable Handsfree.
06 Out Music Mute (to mute e.g. the car radio) High when calling.
07 In Flash Memory Voltage and Service Voltage. Phone enters debugmode when tied to +5V at power-up.
08 Out Logic Reference, Status On. Sources over 100mA.
09 Out Data from Mobile Station. Debug messages appear here at 112KBaud when in debug mode.
10 GND Digital Ground and DC return
11 In Data to Mobile Station
12 I/O DC positive for battery charging (in)/DC for extenal accessory powering (out)

All signals seem to be at 5V logic. Most debug messages are text. Like "CB ok!" etc. Debug messages are trailed by 0x0A, 0x0D. Power-up means removal of battery, reconnection of battery, depressure of "NO".

A portable handsfree kit is connected as follows:
Portable Handsfree (directly connected to pins 01, 02, 04):
01 Earphone: 16 Ohm
02 Microphone: <= 2 kOhm
05 to be connected to 04 (GND)

*#0000# to reset the phones menu-language to English.

>*<<*<* for checking the firmware revision information (software release)

>*<<*<*> 1-row text strings. if pressing yes you can check
the phones text programming in currently selected language. (298 entries)

>*<<*<*>> n-row text strings. if pressing yes you can check
the phones text programming in currently selected language. (160 entries?)

The phone should display something similar to this:

CXC125065   - Cell phone's internalproduct code. 

PRG                        - Firmware revision - software version (date & time stamp).

970715 1515              

LASTEST  Version is: <980114>
Fixes: ???

Fixes in Software version<971009> 
After receiving an SMS the prompt >>Message read?<< stayed
on the screen until you pressed YES or NO. This new software eliminated
this "feature" and when you receive an SMS >>Message read?<< stays on
the screen only for a few seconds then it changes into an envelope.

Fixes in Software version <970905>
(and Ericsson 788 - software version 970716)
The error is described as "MS unable to find HPLMN if 30 or more competitor
ARFCN+s have greater signal strength than the HPLMN."
In other words:
if there are 30 or more channels belonging to other
carriers which are stronger than the customer's home network, the phone
will not be able to find the customer's home network.

Fixes in Software version <970715>
- The bug of the missing arrow on display when all diverting active.
- Key lock key on display turned around , like in manual. (???)
- An updated GSM operators' list.
- Better and more solid reception.
- Changing problem when turned OFF.

Software update, how?

I have been asked a lot about how to update the software in cellular phones.
The easiest thing to do is to go to the nearest Ericsson
dealer and make him do it for you. Just remember that it is supposed to
be free (a receipt is requiet) so don't let him tell you anything else!

The Service Provider (SP) Lock menu is used to lock the cell phone to the
SP's SIM card. Once the cell phone is locked to a specific operator, if one
inserts a SIM card from a different operator the phone will refuse to accept it!
The cell phone will however accept another SIM card from the same operator.

To activate/deactivate this lock one needs a special secret code that is not
available to the end user. (not even to you... or is it ? in case please let me know!)

Here is how to activate the menu:

<**< Lock to Network? if pressing yes you have 5 attempts
to enter NCK.

<**<< Lock to Network subset? if pressing yes you have
5 attempts to enter NSCK.

Warning: Your phone can be locked to a service provider FOREVER by doing this!
If an invalid code is entered all five times, the menu will exit and be deactivated!
Any further attempt to activate the NCK/NSCK lock Menu will result in the response
"Not allowed"! However the NCK/NSCK lock can be recover through a direct clearing
in the EEPROM.

Bat. level indicator when turned OFF...
When the gh688 is turned off and the phone is not changing -
the bat. level can be seen for a short period of time by pressing
the 'NO' key quick once (it has to be quick!) and then wait for
about 2 sec. The bat. level will now be shown in the display
at its normal position.

Access menu without Sim card ...
To access to the menu in your phone without having a card inside do the following:
type **04*0000*0000*0000# When display say "Wrong Pin" press NO and you have access to the all menus: Info, Access, Settings, Calculator, Clock, Keylock On?, Mail, Phone book.
NOTE if you try this on the GH688 your phone may stop at Keylock On? menu and you´ll have to take your battery out to turn the phone on again.
 
Full Network Name...
You can see the Full Network Name by doing the following:
Go to the network menu, when the phone displays the networks
available (in 'Select net' and 'Edit list' menu) you can press * and
you will see the full name.

Full Operator List...
You can view the full operator list by doing the following:
Go to the 'Edit list' menu under 'networks'. The phone say
'please wait' (searching for other networks). When finished,
Press the < key once, then YES twice. Now the phone displays
the full list. Browse through the list with the < > keys.

Free phone calls using the GH688..

NB! This trick has only been reported working on PREPAID GSM CARDS
and in some countries and with some sw versions.

The prepaid GSM SIM CARD is a kind of "SIM card" which only has a sertant
amount of credit on it (like a normal phonebox telecard)...
if it can be traced? - I don't know...

Well..here's the trick you dial the no. normally and press YES. While "connecting"
is shown on the screen, the following procedure should be carried out:
Press CLR then 0 then # and then NO (twice) so as to switch OFF the phone.
You can then still speak on the phone while it is switched off but the
SIM card does not record your calls which will lead to FREE
phone calls in some countries.. we hope!!

Another variant of the code ..
Make a Call, while the phone says Connecting type 083# (the position 83 must be empty! ), when phone says Pos Emtpy, press the NO key and turn off the phone. (Thanks goes to Vanya Pupkin)

If you can make the call with the phone turned off you will face a problem when
you need to hang up the phone...the only way for you to do that is remove the
battery...??? (Please tell me otherwise!!)

Bottom view, keyboard up, counting from the left:

01 Out Audio from Mobile Station
02 In Audio to Mobile Station
03 In External Analog Audio Accessory Sense. Connect to GND to enable external mike and speaker
04 - Audio Signal Ground, 0V reference
05 In Portable Handsfree.
06 Out Music Mute (to mute e.g. the car radio) High when calling.
07 In Flash Memory Voltage and Service Voltage. Phone enters debugmode when tied to +5V at power-up.
08 Out Logic Reference, Status On. Sources over 100mA.
09 Out Data from Mobile Station. Debug messages appear here at 112KBaud when in debug mode.
10 GND Digital Ground and DC return
11 In Data to Mobile Station
12 I/O DC positive for battery charging (in)/DC for extenal accessory powering (out)

All signals seem to be at 5V logic. Most debug messages are text. Like "CB ok!" etc. Debug messages are trailed by 0x0A, 0x0D. Power-up means removal of battery, reconnection of battery, depressure of "NO".

A portable handsfree kit is connected as follows:
Portable Handsfree (directly connected to pins 01, 02, 04):
01 Earphone: 16 Ohm
02 Microphone: <= 2 kOhm
05 to be connected to 04 (GND)

>*<<*<* for checking the firmware revision information (software release)

>*<<*<*> 1-row text strings. if pressing yes you can check
the phones text programming in currently selected language. 

>*<<*<*>> n-row text strings. if pressing yes you can check
the phones text programming in currently selected language. 

>*<<*<*>>> IR version info. if pressing yes you can check
the phones IR device's driver version.

The phone should display something similar to this:

CXC125065          - Cell phone's internalproduct code. 
 PRG                    - Firmware revision - software version (date & time stamp).
 970715 1515              

LASTEST  Version is: <990614>
Fixes: ???

Software update, how?

I have been asked a lot about how to update the software in cellular phones.
The easiest thing to do is to go to the nearest Ericsson
dealer and make him do it for you. Just remember that it is supposed to
be free (a receipt is requiet) so don't let him tell you anything else!

The Service Provider (SP) Lock menu is used to lock the cell phone to the
SP's SIM card. Once the cell phone is locked to a specific operator, if one
inserts a SIM card from a different operator the phone will refuse to accept it!
The cell phone will however accept another SIM card from the same operator.

To activate/deactivate this lock one needs a special secret code that is not
available to the end user. (not even to you... or is it ? in case please let me know!)

Here is how to activate the menu:

<**< Lock to Network? if pressing yes you have 5 attempts
to enter NCK.

<**<< Lock to Network subset? if pressing yes you have
5 attempts to enter NSCK.

Warning: Your phone can be locked to a service provider FOREVER by doing this!
If an invalid code is entered all five times, the menu will exit and be deactivated!
Any further attempt to activate the NCK/NSCK lock Menu will result in the response
"Not allowed"! However the NCK/NSCK lock can be recover through a direct clearing
in the EEPROM.

Bat. level indicator when turned OFF...
When the gh688 is turned off and the phone is not changing -
the bat. level can be seen for a short period of time by pressing
the 'NO' key quick once (it has to be quick!) and then wait for
about 2 sec. The bat. level will now be shown in the display
at its normal position.

Access menu without Sim card ...
To access to the menu in your phone without having a card inside do the following:
type **04*0000*0000*0000# When display say "Wrong Pin" press NO and you have access to the all menus: Info, Access, Settings, Calculator, Clock, Keylock On?, Mail, Phone book.
NOTE if you try this on the SH888 your phone may stop at Keylock On? menu and you´ll have to take your battery out to turn the phone on again.

*#0000# to reset the phones menu-language to English.

>*<<*<* for checking the firmware revision information (software release)

>*<<*<*> 1-row text strings. if pressing yes you can check
the phones text programming in currently selected language. (298 entries)

>*<<*<*>> n-row text strings. if pressing yes you can check
the phones text programming in currently selected language. (160 entries?)

The phone should display something similar to this:

CXC125065   - Cell phone's internalproduct code. 

PRG                        - Firmware revision - software version (date & time stamp).

970715 1515              

LASTEST  Version is: <980114>
Fixes: ???

Fixes in Software version<971009> 
After receiving an SMS the prompt >>Message read?<< stayed
on the screen until you pressed YES or NO. This new software eliminated
this "feature" and when you receive an SMS >>Message read?<< stays on
the screen only for a few seconds then it changes into an envelope.

Fixes in Software version <970905>
(and Ericsson 788 - software version 970716)
The error is described as "MS unable to find HPLMN if 30 or more competitor
ARFCN+s have greater signal strength than the HPLMN."
In other words:
if there are 30 or more channels belonging to other
carriers which are stronger than the customer's home network, the phone
will not be able to find the customer's home network.

Fixes in Software version <970715>
- The bug of the missing arrow on display when all diverting active.
- Key lock key on display turned around , like in manual. (???)
- An updated GSM operators' list.
- Better and more solid reception.
- Changing problem when turned OFF.

Software update, how?

I have been asked a lot about how to update the software in cellular phones.
The easiest thing to do is to go to the nearest Ericsson
dealer and make him do it for you. Just remember that it is supposed to
be free (a receipt is requiet) so don't let him tell you anything else!

The Service Provider (SP) Lock menu is used to lock the cell phone to the
SP's SIM card. Once the cell phone is locked to a specific operator, if one
inserts a SIM card from a different operator the phone will refuse to accept it!
The cell phone will however accept another SIM card from the same operator.

To activate/deactivate this lock one needs a special secret code that is not
available to the end user. (not even to you... or is it ? in case please let me know!)

Here is how to activate the menu:

<**< Lock to Network? if pressing yes you have 5 attempts
to enter NCK.

<**<< Lock to Network subset? if pressing yes you have
5 attempts to enter NSCK.

Warning: Your phone can be locked to a service provider FOREVER by doing this!
If an invalid code is entered all five times, the menu will exit and be deactivated!
Any further attempt to activate the NCK/NSCK lock Menu will result in the response
"Not allowed"! However the NCK/NSCK lock can be recover through a direct clearing
in the EEPROM.

Bat. level indicator when turned OFF...
When the gh688 is turned off and the phone is not changing -
the bat. level can be seen for a short period of time by pressing
the 'NO' key quick once (it has to be quick!) and then wait for
about 2 sec. The bat. level will now be shown in the display
at its normal position.

Access menu without Sim card ...
To access to the menu in your phone without having a card inside do the following:
type **04*0000*0000*0000# When display say "Wrong Pin" press NO and you have access to the all menus: Info, Access, Settings, Calculator, Clock, Keylock On?, Mail, Phone book.
NOTE if you try this on the GH688 your phone may stop at Keylock On? menu and you´ll have to take your battery out to turn the phone on again.
 
Full Network Name...
You can see the Full Network Name by doing the following:
Go to the network menu, when the phone displays the networks
available (in 'Select net' and 'Edit list' menu) you can press * and
you will see the full name.

Full Operator List...
You can view the full operator list by doing the following:
Go to the 'Edit list' menu under 'networks'. The phone say
'please wait' (searching for other networks). When finished,
Press the < key once, then YES twice. Now the phone displays
the full list. Browse through the list with the < > keys.

Free phone calls using the GH688..

NB! This trick has only been reported working on PREPAID GSM CARDS
and in some countries and with some sw versions.

The prepaid GSM SIM CARD is a kind of "SIM card" which only has a sertant
amount of credit on it (like a normal phonebox telecard)...
if it can be traced? - I don't know...

Well..here's the trick you dial the no. normally and press YES. While "connecting"
is shown on the screen, the following procedure should be carried out:
Press CLR then 0 then # and then NO (twice) so as to switch OFF the phone.
You can then still speak on the phone while it is switched off but the
SIM card does not record your calls which will lead to FREE
phone calls in some countries.. we hope!!

Another variant of the code ..
Make a Call, while the phone says Connecting type 083# (the position 83 must be empty! ), when phone says Pos Emtpy, press the NO key and turn off the phone. (Thanks goes to Vanya Pupkin)

If you can make the call with the phone turned off you will face a problem when
you need to hang up the phone...the only way for you to do that is remove the
battery...??? (Please tell me otherwise!!)

Bottom view, keyboard up, counting from the left:

01 Out Audio from Mobile Station
02 In Audio to Mobile Station
03 In External Analog Audio Accessory Sense. Connect to GND to enable external mike and speaker
04 - Audio Signal Ground, 0V reference
05 In Portable Handsfree.
06 Out Music Mute (to mute e.g. the car radio) High when calling.
07 In Flash Memory Voltage and Service Voltage. Phone enters debugmode when tied to +5V at power-up.
08 Out Logic Reference, Status On. Sources over 100mA.
09 Out Data from Mobile Station. Debug messages appear here at 112KBaud when in debug mode.
10 GND Digital Ground and DC return
11 In Data to Mobile Station
12 I/O DC positive for battery charging (in)/DC for extenal accessory powering (out)

All signals seem to be at 5V logic. Most debug messages are text. Like "CB ok!" etc. Debug messages are trailed by 0x0A, 0x0D. Power-up means removal of battery, reconnection of battery, depressure of "NO".

A portable handsfree kit is connected as follows:
Portable Handsfree (directly connected to pins 01, 02, 04):
01 Earphone: 16 Ohm
02 Microphone: <= 2 kOhm
05 to be connected to 04 (GND)