The only way I can use my iPhone is if I jailbreak/unlock it because I'm not with my original provider. So today I stupidly updated to 4.3 normally and realized my SIM was so longer working. So I tried re-jailbreaking with ultrasn0w and it didn't work. Normally I would have downgraded but this update deleted cydia so now I can't do it and I have no idea what to do. I really can't afford to pay $600 for a new phone so is there any way I can get this working again?