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How do I Switch a CDMA/GSM S5 Verizon to AT&T

Discussion in 'Android Devices' started by bobinyelm, Feb 19, 2020.

  1. bobinyelm

    bobinyelm Newbie
    Thread Starter

    I just purchased a brand new G900V CDMA/GSM Unlocked Samsung Galaxy S5 to replace my current Samsung G900A S5 that freezes and has slowed down.

    This is my 3rd S5. The first had a bad mic connection and even though I had a receipt from an AT&T store, Samsung would not honor it, and the second now is having problems after a year. I LIKE the S5, and I am hoping that the "third time is the charm." My wife's S5 has been flawless for 4 years!

    The seller (ebay) said it was 4G Compatible on Verizon/Sprint/AT&T/T-Mobile on both CDMA and GSM.

    I popped my AT&T Sim into it, and when it boots it has a Verizon screen of course, the says it is NOT a Verizon Sim, but then it finds the network and my WiFi, but the Text Message App appears to be a Verizon dedicated one that would have to be changed.

    I dialed some telephone numbers and it seems to work fine, but...

    Can anyone tell me what I need to do to make the phone act like an AT&T phone?

    I did a little digging and supposedly it is 4G LTE compatible on AT&T, but I am an absolute neophyte and know nothing about these phones as far as re-configuring anything.

    So ANY help, or a link that would help someone as clueless as me set it up would be much appreciated.

    I ASSUME the seller was right about it being compatible. They had a bazillion sales and a 99,5% Feedback rating.


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  2. ironass

    ironass Extreme Android User

    Hi bobinyelm!

    The 6 year old Samsung Galaxy S5 model G900V is, as you have correctly stated, one of the 42 models of Galaxy S5 and was built specifically for Verizon's CDMA/GSM network. It was one of two carrier hybrid phones for the U.S.A. The other being the AT&T, G900A, model. See #1.6 of the 42 Galaxy S5 models - Dummies Guide.

    Unfortunately, with these two locked down models of phone, there is nothing that can be done to alter them or root them to rid yourself of the built-in carrier bloatware and unless you can use 3rd party apps, you are forced to accept their features.

    Also, the Verizon, G900V, modem/baseband for CDMA/GSM is only partially compatible with AT&T's GSM network according to WillMyPhonework, in that it will only work fully on the AT&T 3G network on bands 850 MHz and 1900 MHz and can use Band 4-AWS of their 4G network but not Band 17, 700 MHz, or Band 2-1900 MHz of 4G. There is, I am afraid, nothing that can be done to change this hardware feature.

    IMHO, you would do better to get, if possible, the G900A model that is specific to your carrier.
    mydian, kate, Dannydet and 2 others like this.
  3. svim

    svim Extreme Android User

    Just to add, keep in mind that 3G is currently being phased out so within a couple of years it's going to be 4G and up only.
    And just for reference, here's a table on what bands the cellular carriers support:
    (T-Mobile and Sprint may change due to the possible upcoming merger)
    mydian likes this.

Samsung Galaxy S5 Forum

The Samsung Galaxy S5 release date was April 2014. Features and Specs include a 5.1" inch screen, 16MP camera, 2GB RAM, Snapdragon 801 processor, and 2800mAh battery.

April 2014
Release Date

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