How can I take advantage of LTE on my Samsung Galaxy S4 purchased in the UK? I recently got a sim card for my S4 from AT&T and it is saying that it is under HSPA but I was told it is LTE compatible. The model number is GT-i9505 for this UK version. I understand this will be under non-certified servi

Is it possible for me to obtain a SIM from an AT&T store and add data to it whilst I'm visiting the US? (Is there a plan which allows me to do this?) This would only be temporary (less than 30 days). I have an unlocked phone.This would be a huge advantage to me, since it avoids roaming costs.

hii live in UK and thought it would be cheaper if i buy an iphone 5 from USA via ebay but not sure with the locking phone system and how to unlock, does AT&T locked phones work on any UK sims ? and how do you unlock phones, with prices if you could thanks

Hi guys, Pretty frustrated - Apple have told me that my new phone has been locked to AT&T and ONLY AT&T are able to unlcok this phone yet I have been told toldthat my device is incompatible. Pretty sure I believe Apple over AT&T! Someone is definitely lying, might as well throw the phone away seeing

I'll be traveling to the UK and using the International Day Pass and will want to live stream with the Periscope app- I understand that will use my data.  My UK periscope friends always complain about the signal being crap in the UK but they're only with one provider like EE.  I can't find anything

I study in the US but live in the UK, and while in the US I use the AT&T Prepaid service. I am back in the UK for summer vacation, and this month, AT&T charged my account without my knowledge or consent (I do not have autopay) and the UK support number isn't working (constantly on hold). I can't fin

Is it possible to use a UK SIM card in a locked US AT&T phone? It connects to the Vodaphone network for roaming so maybe a Vodaphone SIM would work?