My cell phone started shutting off and finally is totally shut down. I am currently self-employed and this cell phone is my business phone. I ran to get another phone to put SIM card in and won’t work. Suncom says because it’s not compatible. But my daughter has done this before without any problem. So I would like to know from you guys out there about how to unlock Cingular cell phone for a Suncom SIM card as my daughter is not in the country presently. I would really appreciate your useful information regarding this. Thanks.