Buying a used iPhone 7. Its factory unlocked but the guy got it from Verizon. Could I use it on tmobile service. Will it be 4g or lte

Does unlocked means it's cdma and gsm,?

Verizon smartphones are GSM unlocked, so they should work with most carriers around the world. My Verizon LG G3 worked in Mexico using MoviStar without much issue. I use it here in the US with T-Mobile just fine.

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