My phone is JB and UL with ultrasnow. Originally activated with ATT pay and go card but have been using T-Mobile since ultrasn0w was released. I am on itunes 9.2.1 and this morning I purchased an app from the apple store on the phone and there was a new agreement to accept before you could purchase. Well anyway the app downloaded without a problem but I just plugged my phone into Itunes to Sync and Itunes came up with an error saying it did not recognize the SIM and that I should contact an authorized carrier and I could not sync with Itunes. I also had no service on the phone but no other errors.. This phone was synced with Itunes yesterday without a problem. I unplugged the phone launched Cydia and ran the Hactivation patch from the pushfix.info repo and that resolved the problem. Not sure why this suddenly happened today and wonder if it is related to the app download or the new agreement. It will be interested to see if anyone else with unlock experience this.