I have an iPhone 3GS. New Bootrom, not the 2011 new manufacturer chip line, 8GB. It's jailbroken running iOS 5.0.1 no SIM at the moment, all WiFi. Tomorrow I'm going to go get a SIM card for my phone but I'm getting prepaid service. I'm pretty sure I want to go to T-Mobile because of their kickass $30 unlimited text/data plan, but I don't want to brick my phone. How scary is upgrading to iPad baseband with these specs? (I have baseband 05.16.05, so no unlock for me) What is going to be broken/etc? Is it worth it to go do this, or to just go with GoPhone prepaid at $25 a month for just unlimited texting?