I've been reading this forum for a while, but today I ran into a problem I really can't solve. So a finally registered, hoping that one of you guys could offer some advice. Here's the deal (I'll try to make it as short as possible): I've got an unlocked G1, which worked fine on my previous operator (Telia here in Sweden). Today, my new plan, with a new operator (Tele2), started. This morning, I put my new SIM card in, started the G1, and was notified that com.android.phone had stopped unexpectedly. I've done everything I can think of, but this problem persists as long as use the new SIM card. After each force close, the error just repeats itself. Here's what I know: The SIM card itself works flawlessly in other phones. The error doesn't occur until it tries to connect to the cellular network, i.e. after the PIN code is validated. Turning of PIN code authorization doesn't affect anything. After a reboot, before the initial crash, the phone is connected to the cellular network. I was able to call the phone right after a reboot, only to find the same error breaking the call. Neither a soft nor a hard reset does anything. The problem occurs regardless of APN settings. This includes the correct APN settings for the new operator. The new operator has been verified to work with the G1 (see this thread http://androidforums.com/showthread.php?t=1982 ). As I see it, there are a couple of options: The SIM card is incompatible with the G1. One thread on the T-mobile forums supports this theory (http://forums.t-mobile.com/tmbl/board/message?board.id=Android3&thread.id=22262 ). I'll be trying out some friends' SIM cards tomorrow, hoping to find a pattern. The switching of operators / networks itself causes *something* that the phone / OS can't handle? (Note that I'm keeping the same number). Broken phone (seems weird, considering it working with one operator) ?? If anyone can offer some insight or advice, I'll very much appreciate it! (If the solution doesn't involve sending in the phone for repairs, even better. I doubt the overseas shipping will be worth it.) Thanks!