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  1. #1

    Member Since
    Apr 04, 2011
    O2 IPhone 4 will it work with AT and T sim
    I am going on holiday for 3 weeks to america shortly, and do often. I currently have a iPhone 4 on O2.
    If I purchase an AT and T sim will it work in my phone?
    O2 will rip me off with call prices any suggestions?

  2. #2

    Buzzard2010's Avatar
    Member Since
    Oct 22, 2010
    Bretforton, Worcestershire
    MacBook Pro 15" 2014, 2.2GHz i7, 16GB RAM, 250GB SSD, OSX 10.9.5 - iPhone 5s 16gb
    If you bought the iPhone straight from O2 then it will be locked to only using their network. The only option would be to look into Jailbreak/ Unlock.

    My suggestion... get a cheap PAYG phone on AT&T for while you are over there.

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
    May 2011
    Nominated: March 2011 & April 2011

  3. #3

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Or, get an unlocked iPhone 4, which should then work with the AT&T sim card. Just make sure the unlocked iPhone is using GMA. (Which is what AT&T uses.) German T-Mobile unlocked iPhones work in the US with an AT&T sim card.

  4. #4

    Aptmunich's Avatar
    Member Since
    Mar 09, 2004
    Aluminium Macbook 2.4 Ghz 4GB RAM, SSD 24" Samsung Display, iPhone 4, iPad 2
    Yes, all european (GSM) iPhones you've bought outright will work with AT&T (calls and 3G data) and T-Mobile (calls & slower EDGE data).

    However if you got your iPhone on a contract, you can't just swap the SIM unfortunately. You could either pay roaming costs (expensive) or just stick to making voice calls and use wifi wherever possible.

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