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wolfbln · 22-04-2015, 14:52

As you come from UK, why don't you simply take a Three UK Sim card for the US? It roams on BOTH T-Mob and AT&T. I could verify this in 2014. Speed is up to 3G only. The US is a so-called feel at home country.
I know Three is tricky as a recommendation for the UK, but roaming in the US is great. UK domestic rates are much lower than AT&T's.
Coverage depends not only on network but on the frequencies your devices works. AT&T is generally better. T-Mob on 1900 MHz in key markets on 3G, in other areas on 1700 MHz AWS which is not supported by many European devices.

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wolfbln (Offline) Senior Member Prepaid Expert Posts: 206 Join Date: 14 Jul 2014 Country:	22-04-2015, 14:52 As you come from UK, why don't you simply take a Three UK Sim card for the US? It roams on BOTH T-Mob and AT&T. I could verify this in 2014. Speed is up to 3G only. The US is a so-called feel at home country. I know Three is tricky as a recommendation for the UK, but roaming in the US is great. UK domestic rates are much lower than AT&T's. Coverage depends not only on network but on the frequencies your devices works. AT&T is generally better. T-Mob on 1900 MHz in key markets on 3G, in other areas on 1700 MHz AWS which is not supported by many European devices.