Ho do I switch carriers and phones?

Hi! I currently have a Samsung Galaxy 5 with AT&T and I just got a new unlocked phone in the mail, which I plan to take to T-Mobile to set up.

I have not opened up the new phone. I don't have a SIM card either.

I have no idea how this process works. Do I cancel AT&T service before taking to T-Mobile?

I want to keep my same cell phone number too if possible.

Thanks!

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