huge problem: activate, unlock and jailbreak without power button

[eldersoares]

Hello
I've been trying to update my jailbroken iphone to ios 5.1.1. i think what i did wrong was update with itunes. then i'd try to jailbreak again. but i found that i had to activate it first. but it wont activate because my iphone was unlocked and now it doesnt accept my sim anymore. i can't enter dfu mode either because i have a broken power button. so, now, i'm stuck in the activation screen. i can't plug-in in itunes because my sim is not accepted. i can't put a custom IPSW, unlocked or jailbroken, because i don't have a power button. i've been trying to restore with some IPSW that force enter in dfu mode, but i need to do this with itunes. and every time i plug-in in itunes, it just says that my sim is not correct.

what should i do????????????
thanks