US iPhone 5S & SIM

Soldato
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My US cousin is coming over to the UK for a couple of weeks with his iPhone 5S.

AFAIK the 5S is compatible with UK networks, right?

Also he wants data and to be able to phone home. Can anyone recommend a SIM? I'm thinking 3 or GiffGaff.
 
Does he have the CDMA Verizon model or GSM SIM version? Haven't checked the iPhone 5S specifically but normally the CDMA versions don't have SIMs do they?
 
He's asked about getting a new card (SIM) so I presume he has the GSM compatible version.
I'll check with him.
 
As long as his phone is unlocked, get him to check the band frequencies his phone supports and then match with a UK provider on the same bands :)
 
Does he have the Verizon (CDMA) or the AT&T (UMTS) version of the 5s?

The former will be very slow for data (no UK 3G support), but the latter will work on all the UK 3G networks.

No LTE though.
 
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