SIM free iPhone?

[TurboJobo]

Hello and thanks
Im going to buy an iphone 7 from apple tomorrow but I need a phone that works both with ATT and TMOBILE and also world wide because i travel to mexico and other countries a lot.
There are 4 models
which one has the most or better bands?
i heard something about the sim free model having an att band 30? which the others dont have
please help ;c

 

[nebo1ss]

https://www.techwalls.com/iphone-7-plus-model-differences/

Read this and make your own decision.

 

[Applejuiced]

Get the official sim free or a verizon one.