If you bought a verizon phone, it is locked on the provider. They should make it sim lock free when the contract is over. For that they should give you a code and directions how to use the code. Then still you could be in trouble, because not all providers use the same transmitter systems. They all call it 3G or 4G, but the systems differ in details, making it in a lot of cases impossible to use an unlocked phone on another cell system.
So first ask the unlock code then check if it works on an other SIM.
You need the vermin sim to unlock the phone in the first place.
There are web sites who offer unlock codes, but you have to pay for that and it not always is successful.
SOURCE: My straight talk LTE android phone needs the sim card either activated or registered
Look at the card provider website on registering activation of card or contact card provider to activate
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