Does an At&t iphone 5s work with a T-mobile nano sim card?

I heard some iphones come unlocked now. Will an iphone 5s from at&t work right away if I insert a nano sim card from T-mobile?

IPhones have been sold unlocked since 2010, fyi.

In your case, no. That AT&T iPhone is locked of course to AT&T. Any iPhone sold through a carrier is locked to that carrier. Apple themselves at their stores sell unlocked ones.

So, again, no, it would not work. That iPhone would have to be unlocked for it to work with a T-Mobile SIM.

It's at&t iphone 5s so I guess it is locked to that carrier

Only if it indeed an unlocked iPhone… The trouble with "heard things" they are most often wrong.

Verizon iPhones from 5+ come factory unlocked. AT&T iPhones do not.

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