IPhone 5 on Sprint network with iOS 7 saying that I have Invalid SIM?

Can I still use my phone? How do I get it to work? I haven't done anything to my phone- all I did was download iOS 7.It is not jail broken and I didn't have iOS 7 beta or anything. It says "invalid SIM" where it usually says Sprint and the dots showing my signal strengthand I don't even know why. I've got LTE and unlimited data if that has to do with anything. Can someone help me get my service back?

Alot of people have been having this problem but if you have a computer use your computer to update it. It will work 100 percent

Turn you phone completely off and back on again

I have the same problem too, and don't know what to do next T^T

I had to turn my phone off and on all day yesterday since I'm getting the same error. The sprint rep said the download of ios7 is corrupted. He said restore the phone to factory settings and re download iOS 7. Mine hasn't done it since.

Rebooting my ipad worked for me. But didn't do a thing to make Sprint cellular any faster!

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