Can an unlocked ATT iPhone 4 be used on Verizon?

Discussion in 'iPhone' started by sixxmum, Sep 24, 2012.

  1. sixxmum macrumors 6502a


    Aug 15, 2010
    I'm reading conflicting things. Some sites seem to be saying that an unlocked phone can be used on any network, others seem to say not. If not, what networks *can* an unlocked ATT iPhone be used on?
  2. mbsaeger macrumors 6502


    Jun 18, 2009
    An unlocked iPhone 4 can be used on either CDMA carries or GSM carriers depending on which radio is in it.. The iPhone 4S (unlocked) can theoretically be used on any carrier as it has both radios.
  3. rritterson macrumors 6502

    Jul 10, 2008
    DC USA

    Unlike the iPhone 4S, the iPhone 4 had two models, a GSM model and a CDMA model.

    AT&T uses the GSM standard, and an unlocked AT&T phone will work on any GSM network worldwide, which includes T-Mobile and nearly every carrier worldwide except Sprint, Verizon, and one Japanese carrier.

    The iPhone 4S has a dual GSM/CDMA chip in it, so one model works on all networks. However, if you activate it on Sprint or Verizon, you are stuck with that carrier in the USA. Sprint or Verizon will unlock the SIM slot for you to use international GSM carriers though, so you can travel and avoid expensive international roaming charges. AT&T 4S's don't have the CDMA side active, so an unlocked version still won't work with Verizon, though, like the iPhone 4, will work with just about any network worldwide.
  4. sixxmum thread starter macrumors 6502a


    Aug 15, 2010
  5. Idefix macrumors 6502

    Jul 10, 2012
    as far as I know, Apple only sells unlocked iPhones in the GSM version.

    No unlocked iPhones come in cdma.
  6. vpqmom macrumors newbie

    Jan 23, 2013
    used on Verizon's U.S. network?

    so can an unlocked Verizon iphone 4s be used in the U.S. on Verizon's network? I would like to use the iPhone as a cellphone and use wifi only, without getting a data plan. (we already pay enough in data fees for my husband and son! =-) I do NOT want their data share plan. )
  7. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    There's no such thing as an unlocked verizon 4S. All verizon 4S iphones are locked to verizon. If you get an iphone any iphone and try to activate it on verizon the data plan is mandatory. Even though you might not want it or need it they will make you pay for one or you wont be able to activate it on your verizon account.
  8. scaredpoet macrumors 604


    Apr 6, 2007
    Two problems:

    1. The iPhone 4 came in CDMA-only and GSM-only variants. So even unlocked, an AT&T iPhone 4 won't work on any CDMA network.

    2. Verizon will not, as a rule, activate a phone if its MEID is not in their inventory.
  9. toadc69 macrumors newbie


    Jul 17, 2012
    Twin Peaks
    Muchos Gracias!

    Thank you, will have to advise them to eBay that iPhone 4 or dump verizon.


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