I've got an iphone 4, iOS 4.1, jailbroken w/limea1n and unlocked with ultrasn0w (latest version). I noticed that if I reboot my phone, it will sometimes refuse to connect to T-mobile and show the 'Searching...' dialogue and eventually give up on getting a signal. When this happens, the only thing that fixes this is another 1 or 2 reboots. Have any of you seen this weird behavior? Do you think that jailbreaking with GP would fix this?