Front camera on iPhone 4 stopped working?

I've tried replacing it to no avail. I've tried a soft and hard reset. I've cleared memory, I've turned on and off in restrictions. I've tried the "cover the sensor up" thing, didn't work. I've closed apps I wasn't using, that didn't help.

Here's my problem. I'm using straight talk so if I update I need to make sure I can re jail break and unlock it again. Most of my contacts use iPhones so without iMessage I'd have no way to contact them. I'm scared to reset and loose everything. So someone with experience with this please give me some advice. If I update is that a likely fix? And if so will I be able to rejailbreak and change apn and use Cydia?

Maybe its time to invest in a newer phone.