What will happen if I put tmobile sim in a locked iPhone 4s?

What will happen if I put tmobile sim in a locked iPhone 4s?

I'm not exactly sure, but I know you won't be able to get service, since a locked phone will only work with its original carrier until you unlock it.

But it won't hurt the phone or the SIM card, I do know that.

You would get an error message.

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