You are correct, your phone is made for calls and should be working. It saddens me to learn that you have been unable to use your phone for the past week. Thank you for taking the steps that were provided to try to get service to the phone. Were you able to go into a direct store to get a new sim card? If so please let us know how the phone is working now? If you still have no service to the phone, please tap settings, general, and about to see if an update is available to the carrier settings.
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