Can I use an unlocked Verizon iphone 4 on Tmobile?

If so, how? If I can't, what should I do?

No, only because its not the same company as the phone. You can either sell the iPhone or change to Verizon.

Hi unfortontly i don't think you can.since verison phones don't need sim cards they don't even have a slot for one. I had a veroison iphone 4 i was trying to switch to att i ended up selling it back to att i would recommend you try to sell your phone then buy a unlocked att or other carrer with a sim card slot to switch to t mobil also if you traid in your 4 and get a 4s or higher it will have a sim card slot. I hope this makes sense i'm sorry about the spelling i i'm awair i'm a terrable speller. If you need more help post in additonal information

No because all of T-Mobile's phones are GMS and do use sim cards and Verizon doesn't use and the best thing to do is find a Metro PCS or another cellphone company that does use CDMA and the phone will have to be flashed in order to work on another CDMA cellphone provider or sell the phone and buy a new phone from T-Mobile

Verizon is a CDMA network
T-Mobile is a GSM network

The iPhone 4 is either a GSM or CDMA phone. So in this case if it is a Verizon model it will never work on a GSM network.

Most Verizon phones have dual radios aka GSM as well as CDMA just need to get the phone unlocked to enable access on another network

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