Jailbroken iphone No Service?

I got a phone on ebay that was jailbroken but NOT unlocked. I got a new compatible SIM card but it is not working (phone does not have to be unlocked for straight talk). Now I don't care about the jailbraking and just want a phone that works.

BUT I can't restore on iTunes (the button is gray and I can't click on it)
OR erase all data.

So I want to upgrade to 5.1.1… Will my phone get bricked? I'm running out of options to make this thing work…

Go to iphoneadmin.com its a free website that gives u information about your iphone its helpful i used it

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