I have T-Mobile in the US, but in practice I get a different T-Mobile prepaid GSM SIM when I visit the UK.
I haven't actually looked at what the international costs are, just heard enough horror stories that I take the US SIM completely out of my phone before takeoff.
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T Mobile operates in the UK. They have a number of mobile devices, including 4G mobile wifi hotspots.
(http://mobile-broadband.t-mobile.com/mobile-hotspot)
I have T-Mobile in the US, but in practice I get a different T-Mobile prepaid GSM SIM when I visit the UK.
I haven't actually looked at what the international costs are, just heard enough horror stories that I take the US SIM completely out of my phone before takeoff.