1. saintforlife's Avatar
    I am not sure of the frequency differences between AT&T/T-Mobile and 521/520. I want to unlock my 521 and put in my AT&T SIM card and use this phone as my daily driver for a while. Will I be able to make calls without issues (are the cell frequencies compatible)? Also what kind of data speeds can you expect with an AT&T SIM on the 521?
    08-10-2013 11:05 AM
  2. Corepc's Avatar
    It Supports AT&T 3g/4g HSPA Bands and should work fine on AT&T if you can get it unlocked.
    08-10-2013 11:09 AM
  3. Colby Lee's Avatar
    2g only. My advice is to use simple mobile for the time being, unless you are stuck in contract and would have to pay extra, then I would go to your local at&t store and purchase the 520 for 100 bucks.
    08-10-2013 11:13 AM
  4. Colby Lee's Avatar
    Any tmo branded phone will not receive at&t's 3g. Been doing it for years, and just recently experienced it on 3 devices through my family/friends , so I know it hasn't changed.
    08-10-2013 11:16 AM
  5. tgp's Avatar
    I am not sure of the frequency differences between AT&T/T-Mobile and 521/520. I want to unlock my 521 and put in my AT&T SIM card and use this phone as my daily driver for a while. Will I be able to make calls without issues (are the cell frequencies compatible)? Also what kind of data speeds can you expect with an AT&T SIM on the 521?
    I did exactly that. I have a Net10 SIM card using AT&T, and when I put it in my unlocked 521 it works great, including MMS & 4G. I've seen speeds up to 7Mbps down, but of course that varies greatly by location.
    jdbii likes this.
    08-10-2013 11:40 AM
  6. saintforlife's Avatar
    2g only. My advice is to use simple mobile for the time being, unless you are stuck in contract and would have to pay extra, then I would go to your local at&t store and purchase the 520 for 100 bucks.
    It sucks if it is only 2G. Damn I should have waited for the ATT version of 520. It is cheaper, doesn't have the stupid logo in the front, has better proportions (4mm shorter) as a result and has more accessory support being the same as the global model of 520.
    08-10-2013 11:49 AM
  7. mogelijk's Avatar
    It sucks if it is only 2G. Damn I should have waited for the ATT version of 520. It is cheaper, doesn't have the stupid logo in the front, has better proportions (4mm shorter) as a result and has more accessory support being the same as the global model of 520.
    As others have stated, it will get 3G/HSPA+ speeds on AT&T. The L521 has the 1900 Mhz band that is needed for 3G on AT&T.
    08-10-2013 01:37 PM
  8. Colby Lee's Avatar
    I did more research and I was wrong. It apparently does support 3g. That's what I love about technology, no matter how knowledgeable you are, there's always something new to learn.
    xdalaw likes this.
    08-13-2013 10:07 PM
  9. WPhoney's Avatar
    What if I do the opposite? I mean, what if I unlock an AT&T 520 and take it to T-Mobile? Would I lose any wireless bands?
    08-17-2013 06:43 AM
  10. tgp's Avatar
    What if I do the opposite? I mean, what if I unlock an AT&T 520 and take it to T-Mobile? Would I lose any wireless bands?
    Yes, I tried that too. Data on T-Mobile will be Edge, unless you happen to be in one of T-Mobile's refarmed areas.
    08-17-2013 06:57 AM
  11. rkin92's Avatar
    Yes, I tried that too. Data on T-Mobile will be Edge, unless you happen to be in one of T-Mobile's refarmed areas.
    Sightings of T-Mobile 3G/4G/HSPA+ coverage on 1900MHz (PCS/UMTS band II)

    http://support.t-mobile.com/docs/DOC-5736

    So if you live in a major city, you are in luck.

    The speed imo is enough for me. When I use friends VZW LTE phones, I notice a difference but its meh to me... since im on wifi 97% of the time.

    Ironically, EDGE isnt that slow for me either if you use Opera Mini/Nokia Xpress Browser for simple things.
    08-17-2013 09:52 AM
  12. worldspy99's Avatar
    7 Mbits/sec, someone had posted screenshots in late 2012. If I can find that thread, I will post it here.
    11-25-2013 06:44 PM

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