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Unlocked S3

I wasn't able to find an answer amongst the board, but would a factory unlocked Galaxy S3 (not an international version) be able to work with T-mobile's 4g and data?

Thank you for any provided help.

  • 1. Re: Unlocked S3

    If you live in an area that has been refarmed to 1900/2100 freaquency, then yes. Many major cities have been updated. If you live in a more remote area that uses the 1700/2100 frequency, then no. This unofficial map may help guide you. http://www.airportal.de/ . Also, see the TMO blog: http://blog.t-mobile.com/ and the unofficial, but well informed http://www.tmonews.com/ blog.


    International versions don't operate on 1700/2100 and the current versions won't work on LTE. TMO will be releasing a new LTE S3 sometime here in the US. Hope this helps

  • 2. Re: Unlocked S3

    It will also depend on the model of the S3 or the provider it is locked with. Who was the original carrier?

  • 3. Re: Unlocked S3

    Looking at the unofficial map you provided (http://www.airportal.de/), if i live a little less than 2 blocks away from a 3g/4g area (the areas in pink I pressume), would I still be able to recieve that kind of coverage, or would I be drop to 2g/edge?

    Thank you for your help

  • 4. Re: Unlocked S3

    To my understanding, there was a factory unlocked version of the S3, and it is able to use any gsm carrier. If this phone has an actual unlocked version (not flashed or unlocked by anyone), I was hoping to use this phone with a pre-paid plan. The phone I was looking at was on amazon, and it does not say the international version- so I thought that I would be able to use it with 3g/4g coverage and data on the phone. I apologize if I'm not using correct terms for "coverage" and "data", this will be my first smart phone, so I was hoping to get a good smart phone as my first!

    Thank you very much for your help.

  • 5. Re: Unlocked S3

    Do they say where it was unlocked from (carrier)? Post the link to the phone so we can check to see what model it is. It will have to be a GSM phone to work.

  • 6. Re: Unlocked S3

    I could not find where it says it was unlocked from a particular carrier, but I did notice that it states it is a "factory unlocked phone". The S3 I was looking from is from amazon, and it also says it is a GSM phone.

    I appreciate you helping me out with this,

    here is the link:


  • 7. Re: Unlocked S3

    From the link it is the International model GT-I9300. It should work, just not sure of the 4G as T-Mobile uses a different Frequency from most GSM providers.

    • 3G Network HSDPA 850 / 900 / 1900 / 2100
    • GSM 850 / 900 / 1800 / 1900
    • 16 GB storage, 1 GB RAM
    • Accelerometer, gyro, proximity, compass, barometer
    • Exynos 1.4 GHz Quad-core Processor
    • Best DROID phone on the market,WiFi a/b/g/n, WiFi HT40
  • 8. Re: Unlocked S3

    The idea that there exists a factory unlocked locked phone is an oxymoronic. When you buy a SGH-T999 from TMO, then it is locked. You request an unlock code when you need it and then you can use with other carriers. If, otoh, you bought it "new" from Amazon or Ebay and it is unlocked, it means the seller unlocked the phone and is reselling it as unlocked. Technically, it is not new anymore, and may even not have a warranty. All it means it you can get a cheaper S3 than buying through the vendor, and can use on other networks, like AT&T or internatioinally. I did this myself, by the way and am very happy with it.


    The only to assure the phone is unlocked is to take an AT&T sim card from a live phone and put it in your TMO. If you get a prompt to enter an unlock code, your phone is locked. If you are able to register to the AT&T network, you are unlocked. The US S3, SGH-T999 can reach the 1900/2100 spectrum whether locked or not.


    Frequencies and Data TypeHSPA+/UMTS Quad-band: 850/1700/1900/2100MHz; GSM Quad-band: 850/900/1800/1900 MHz


  • 9. Re: Unlocked S3

    Not exactly accurate. Most of the  International I9300 are not locked to a carrier, which means they would be Factory unlocked phone by Samung.

  • 10. Re: Unlocked S3

    I was referring only to SGH-T999. Almost all international phones are unlocked due to international treaties and laws.

  • 11. Re: Unlocked S3

    The OP is looking at buying an International model, that is what this thread is about, weather it would work on T-Mobile or not.

  • 12. Re: Unlocked S3

    I believe op said "(not an international version)".. That's why I focused on SGH-T999

  • 13. Re: Unlocked S3

    I went to the link he provided and it is the  International I9300.

  • 14. Re: Unlocked S3

    I guess the link I put up was an international model, and I did not know it. Thank you for your help though. I have another question if you don't mind helping me out with with it: you said if I am living an area that has been refarmed to 1900/2100 frequency, then it would work. I live in Salem Oregon (97301), and looking at the map http://www.airportal.de/ , I wasn't sure if I had to be exactly in the pink areas to recieve 3g/4g. If I live outside of 2 towers (or areas in pink) ( and barely 2 blocks away from one tower), would I be able to have 3g/4g speeds of data and signal strength on the international S3 phone?

    I wasn't sure since I know the international S3 uses different frequencys than Tmobile. However, I know that Tmobile was refarming some areas and I thought that it would allow unlocked phones or iphones to be able to use the 3g/4g data strengths.


    Thank you for your time.

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