T-Mobile in USA, Locking unlocked Phones

[Lostanddamned]

I am looking to travel over to the USA for 10 days to visit some friends soon, and I was thinking of using T-mobiles no annual contract sim only deal.

When I look into activating this, it asks for my phones IMEI number. The only reason I can think of for this is to lock my phone to their network

This would obviously be a complete pain in the proverbial, does anyone know if this is the case (I know that they do this in the UK)

 

[NewAnger]

I am looking to travel over to the USA for 10 days to visit some friends soon, and I was thinking of using T-mobiles no annual contract sim only deal.

When I look into activating this, it asks for my phones IMEI number. The only reason I can think of for this is to lock my phone to their network

This would obviously be a complete pain in the proverbial, does anyone know if this is the case (I know that they do this in the UK)

The phone will not be locked.

 

[TitanApe]

Giving them the info won't lock your phone. All it does is help them identify the phone your using on their network.

They required that info for my Nexus 4 and it is as unlocked as the day I bought it.

 

[Applejuiced]

You are mistaken.
It is not to lock the iphone to their network. Locking is only done when someone purchases a phone subsidized by the particular carrier with a contract agreement.