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Old October 9th, 2012, 11:34 AM   #5 (permalink)
Hadron
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You should be fine with GSM and UMTS (3G).

4G won't work - O2 (and hence GiffGaff) don't have any 4G coverage. But in any event the only 4G there will be (at end of month) uses a different frequency band from the US, so it doesn't really matter what network you are on in that respect.

One thing to watch: you did buy your Nexus direct from Google, ie it's not locked to a particular network's SIM cards?
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