ERICSSON 688

To view IMEI number *#06#

To view Software Version enter -> * <- <- * <- * CLR (Use with Care)

To reset phone language to English *#0000#

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

>*<<*<*>> n-row text strings. If pressing YES you can check the phones n-row text programming in currently selected language.
Quick dail last number press #0 yes

Quick dail shortnumber 10-99 press **# yes ex. to dail number 22 then press 22# yes

Free phone calls using the GH688!!..

This trick has only been reported working on PREPAID GSM CARDS......
so if you haven't got one of these it's probably not working....

The prepaid GSM SIM CARD is a kind of "SIM card" which only has a certain 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!!

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.

Pinouts

1 = + external power supply. 7.2v @ 600mA.
2 = RS232 input (TTL)
3 = GND (digital)
4 = RS232 output (TTL)
5 = +5V output. Limited.
6 = Test. Switch phone off and provide +5V and switch back on. (set comms at 9600, n,8,1)
7 = Mute (0 - Normal, 1 - In Call)
8 = Internal/external (0 - External Mic/Speak, 1 - Internal Mic/Speak)
9 = GND (analog)
10 = Related to Mic/Speak
11 = BF in
12 = BF out