I brought an iPhone online it says sim not valid what to do?

I put in the new sim card from t-moblie but the carrier was Verizon, the seller said it was unlocked but when i put it in it says sims not valid. What should i do?I brought an iPhone online it says sim not valid what to do

Try inserting a Verizon sim card.it is a locked version of iPhone with Verizon. For how much did you get it. Try unlocking it with Verizon.

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