re: iPhone 4 firmware: 4.0.1 baseband: 1.59.00 unlocked: ultrasn0w jailbreak: jailbreakme.com I had unlocked my iphone last month and ever since then it's been working fine. i would have the occasional "no service" or the one service bar of death but nothing a quick reboot wouldn't fix. HOWEVER, today out of curiosity, I removed my sim tray for a split second to look at my Tmobile sim. I quickly slipped the sim back in thinking everything would be fine. NOPE! the "no service" sign came back on and this time, it never went away. I have rebooted my phone 10 times already and nothing. I've also done a network reset which fixed nothing. hours later, it now says "invalid sim" which i've never gotten before I also noticed that my "cellular network data" tab is missing. It's no longer in my settings>general>network I'm thinking of just restoring to factory settings, jailbreak with pwnage tool then getting a Gevey sim. I'm about ready to give up. please someone help!