Problems making calls after upgrading to iOS7

Hi everyone. I'm stuck in a rut with this and I've called my service provider, but they weren't able to help me at all.
Anyway, so here's the situation: after upgrading to iOS7, I started having problems making outgoing calls.  The voice prompt kept telling me to check my phone settings, and I did, but I didn't fine anything wrong with it.  I tried to isolate the problem by transferring my SIM to another phone and it worked perfectly, which means it's really my iPhone that's acting up.  I'm using an iPhone 4s, model A1387. modem firmware 5.0.00.
Hope someone can help me out with this...I use this phone for business transactions and it's essential that I get to have 100% full use of it.
Thanks.

I experience this problem too. I am using iPhone4 and just upgrade it to iOS7. And now I can not make outgoing call. I checked all the setting, and nothing wrong. I even replaced my sim card with the new one, still can not help.
I read this link
https://discussions.apple.com/thread/5322252
and I try dial *#31#, it help, but not permanent solution.

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