Show IMEI code If you need to know what's the IMEI code of your phone, simply press:

* # 06 #

you'll read it on display.
Show Software version and manufact. date Following procedure will show on your phone the software version in first two rows of the display and manufacturing date of the phone on the last one.

> * < < * < *

(simbols ">" and "<" are respectively the right and the left arrows of the keypad)
Reset Menu Language To quickly reset menu language to english, simply type:

*#0000#
Battery check To check the battery level when the phone is off and not charging, press very quickly:

NO

and wait for about 2 seconds.
Full Network name To see the Full Network Name:

Go to the Network menu

when the phone displays the networks available press

*

and it will show the full name.
Test Ring Melodies Want to test the melodies for your ericsson GH688 phone on your PC before typing it into the cellular?

Try this: GH688.exe
Free Calls

Warning !
Make free calls with your phone is a fraud and it's NOT LEGAL, so we publish this tip for educational purposes only! What you'll do of this knowledge is your business only!
This tip seems to work with some provider only.

Dial a number as normal and press YES

While showing "connecting" on the screen, press

CLR
0
#
NO (twice)

in order to switch OFF the phone. You can then speak on the phone even though it is switched off but the SIM card does not record your calls.
Ring Melodies Want to personalize the ringer music of your phone but don't want to be bothered from a lot of wrong attempts?
Well, here are a lot of tested melodies, ready to be used!
Pin-out Bottom view, keyboard up, counting from the right

1 = + external power supply (7.2Volt - 600mA)
2 = RS232 input (TTL)
3 = GND (digital)
4 = RS232 output (TTL)
5 = +5V output
6 = Test (0=Normal - 1=test mode)
7 = Mute
8 = Internal/external mic and ear (0=External - open=Internal)
9 = GND (analogic)
10 = ?
11 = BF in
12 = BF out