Urgent! Phone can't make phone call after upgrading to ios 6

Hi guys,
I use my US factory unlocked iPhone 4s 32GB in China (Carrier is China Mobile). The phone can't make phone call (has no carrier service signal) after I upgraded its OS to ios 6. Does anybody know how to fix this problem?
The facetime also missing after upgrading to ios 6.0
Thanks in advance!

Whenever I see "factory unlocked" I get suspicious, because there is no such thing as "factory unlocked". If you purchased the phone directly from Apple and the receipt says "unlocked" then it is unlocked. If you did not purchase it directly from Apple it was hacked to unlock it by whoever you bought it from. The "factory" was the back room of the shop. Unless you bought it directly from Apple (or an Apple-supported cellular carier) your phone was hacked, and updating it undid the hack. If this is the case there is no solution that can be discussed in an Apple-hosted forum.
If you really did buy it unlocked directly from Apple then razmee's suggestion is the way to go.

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