New iPhone 5s T-Mobile upgrade service not working?

Recently upgraded my phone from the Galaxy S Blaze to the new iPhone 5s.
I love the phone, however my service doesn't seem to be working on it.
I can only access my Wi-Fi.
Is there a process to take when getting an upgraded phone from T-Mobile?

It might be your SIM card, they go bad, if you don't think it's the SIM card try putting your phone in airplane mode and then off airplane mode it should work

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