Iphone 4 CMDA to GSM conversion?

I just bought an iPhone, no sim card. I guess there's different iphones with each carrier.

So I wanna convert mine to a GSM phone, I looked up a gsm motherboard and it's 80 bucks. Are there any cheaper ways to get my phone on the Tmobile plan? (sim card)
The phone is unlocked btw

You'd be ahead to sell yours and get one that's already GSM

Sell it and buy a GSM model the next time.

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