I never had any issues with my old prepaid MTN simcard in my SGS.
All USSD codes worked just fine for data and voice, etc.
All USSD codes work fine. The problem only appears to happen when receiving the confirmation SMS from MTN via cell no '555'. I havent tried it since I upgraded my firmware to stock 2.2.1 (mine is an UK import SGS - upgraded thru Kies - no hack!) The process com.android.phone is a common problem tho and it relates to Android and not the phone itself. Just google it and see what comes back. It all seems to point to the problem being with the sim...
I need to actually get a new sim card for my contract - so once that is done hopefully I wont see the problem again - irregular as it is.
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