Samsung Galaxy S USSD Code Running Problem - solved
1) There is known bug/problem in Galaxy S with eclair 2.1 that USSD code stops working after some time in . I faced this problem for many days and was unable to use some GSM services like balance checking etc. I did not find any solution for it on internet.
Luckily, I was able to pin point the cause which was creating the USSD problem and just want it to share so that your time can be saved.
I observed the mobile tracker is causing the problem. As soon as I turn it off USSD works fine. When the mobile tracker is On then USSD is screwed up again. I am sure there may be other apps which can cause similar problems ... please share if u find any...And of course all galaxy S users..please confirm if the mobile tracker is casing issue in your phones as well??
2) Edit Update - For those who find "Mobile Tracker" is not the root cause --
Backup your important data.
You have to do a clean install / Factory RESET once again... try to isolate the problem causing app by installing the apps one by one and checking the USSD code functioning...for me it was mobile tracker on galaxy s Android 2.1 .....
I know this is quite tiresome work when you want lots many apps on your device...
But then you have to make a choice.
3) USSD code error when i do a speed dial..
Please hold speed dial digit for few seconds instead of using # then number OR number then call...