First, call your carrier and have them reset you on the network.
If that does not work, put the sim card in a carrier branded phone. (a phone your carrier sells) then back in the iphone.
If that doesn't work it means that the turbosim (a very thin device that is installed on the sim card) has gone bad. This is the device that actually unlocks the iphone.
You will either need to get a new one, or look in to a software unlock that doesn't utilize the turbosim.
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