I recently changed my iPhone 4 from AT&T to Straighttalk, without a hitch. Not a single problem once I got all of the APN settings set the way they need to be.
My dad's iPhone 3GS, on the other hand, I'm having a lot of difficulty with. It's running iOS 5.1.1 and it WAS running BB 5.16.05. The only thing I could find online to do was upgrade it to iPad BB 6.15.00, granted that it was made after a certain week of a certain year. All was fine, and it upgraded no problem. I'm still getting No Service. The SIM is active, and I've even found a way to downgrade the BB to 05.13.04, and done so. I installed SAM and ran it like I was supposed to, and still nothing. I've restored it probably 3 times. It's jailbroken. I don't know what else to do. Right now my dad doesn't have a phone and I don't know what else to do to get it working. Straighttalk customer service is no help, either. I'm hoping someone here could maybe help me? I'm at a total loss and I don't want to go through all of this trouble for nothing.