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Thread: Switching from AT&T to T-Mobile SIM

  1. #1
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    Switching from AT&T to T-Mobile SIM

    Hi all -

    I was wondering if anyone had tried to carry both an AT&T sim and a T-Mobile sim for ST at the same time. I am switching to a T-Mo sim when it gets here in the mail because AT&T data speeds suck in Seattle. What I am curious of is: will my AT&T sim be dead and unusable after I switch to the T-Mo sim or could I use it again at a later date (on the same account). Reason I ask is my family goes on vacation once and awhile to where AT&T has service but not T-mo, so I was hoping I could activate the AT&T sim then switch back to the T-Mo after the holiday. Quite a bit to ask of a carrier, I know - but thought it would be neat to have the choice!

    Thanks

  2. #2
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    Switching from AT&T to T-Mobile SIM

    It will be dead and unusable.


    Sent from my iPhone 5

  3. #3
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    Switching from AT&T to T-Mobile SIM

    It won't work. I did this a few months ago and the AT&T SIM was dead after I transferred.

  4. #4
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    If you want to spend the money, you could go for two lines of service (a SIM on each). That's about the only way it could be versatile enough.

  5. #5
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    T-Mo speeds won't be that much better than ATT. If you are lucky you will get 10-12Mbps tops

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    Switching from AT&T to T-Mobile SIM

    Quote Originally Posted by ivaz View Post
    T-Mo speeds won't be that much better than ATT. If you are lucky you will get 10-12Mbps tops
    ...which is better than AT&T's inconsistent data speed around the Seattle area. Once everyone moves over to T-Mobile, we'll see.

    John L.


    Sent from an iPhone 5 using Tapatalk!

  7. #7
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    Switching from AT&T to T-Mobile SIM

    Quote Originally Posted by ivaz View Post
    T-Mo speeds won't be that much better than ATT. If you are lucky you will get 10-12Mbps tops
    It all depends on area. In areas where T-Mobile has a HSPA+ 42mbps network and you have a 42mbps capable phone (ie SGS3, Blaze 4G, Nexus 4, Amaze 4G) then it will be faster than AT&T. You can hit 10-12mbps on Tmobile's 21mbps network with any good phone.


    Sent from my iPhone 5

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    on a good day when you hold your mouth right. Between tower congestion and tcpip overhead you get about 6-7 topped out of HSPA 21 and 10-12 topped out of HSPA 42.

  9. #9
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    Quote Originally Posted by h4xit View Post
    will my AT&T sim be dead and unusable after I switch to the T-Mo sim or could I use it again at a later date (on the same account).
    I did just that for a few months but I used an ST SIM for AT&T and a separate SIM from T-Mobile (not ST). T-Mobile has a nice $30 plan which gives me 100 minutes of talk and 5Gb of data. I would need to keep the ST number refilled or lose it...they say after 30 days of inactivity..but the T-Mobile account remains active for 90 days. I would refill $30, use the T-Mobile SIM, then let it sit for a month or so. This could add up to $85 a month, but not if you let one account 'rest'.

    You may eventually decide what I did: switching is a hassle (Although Google Talk makes it easy). Eventually I chose one network over the other for full-time use.
    Bill Radio
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  10. #10
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    Switching from AT&T to T-Mobile SIM

    Quote Originally Posted by ivaz View Post
    on a good day when you hold your mouth right. Between tower congestion and tcpip overhead you get about 6-7 topped out of HSPA 21 and 10-12 topped out of HSPA 42.
    And during normal business hours on AT&T HSPA you'll see 5-8mbps period.

    Congestion isn't only an issue on T-Mobile. But again, it depends on where you are. T-Mobile has 3x more towers than AT&T and therefore has less issues with congestion.


    Sent from my iPhone 5

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    I got a Note II and I was getting 25-30MB on the T-Mobile $30 prepaid account. The voice coverage is not that great around here so I unlocked my T-Mobile phone and got an ATT ST sim. Now I get excellent voice coverage and still get 6-14MB data all over town. That is quite acceptable for me.

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    Quote Originally Posted by silentjudge View Post
    And during normal business hours on AT&T HSPA you'll see 5-8mbps period.

    Congestion isn't only an issue on T-Mobile. But again, it depends on where you are. T-Mobile has 3x more towers than AT&T and therefore has less issues with congestion.


    Sent from my iPhone 5
    I'm thinking of making the switch from AT&T E71 Sim to BYOD T-Mobile and getting a nexus 4. Do you have a suggestion on a sim cutter as I understand straight talk doesn't offer a micro sim for T-Mobile?

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    Quote Originally Posted by dynastyy View Post
    I'm thinking of making the switch from AT&T E71 Sim to BYOD T-Mobile and getting a nexus 4. Do you have a suggestion on a sim cutter as I understand straight talk doesn't offer a micro sim for T-Mobile?
    You can cut the sim to micro sim

  14. #14
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    Quote Originally Posted by Elpidio View Post
    You can cut the sim to micro sim
    Will any of these cheap sim cutters do or is there one better than other?

  15. #15
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    Switching from AT&T to T-Mobile SIM

    Quote Originally Posted by dynastyy View Post
    Will any of these cheap sim cutters do or is there one better than other?
    The $3-5 cutters work fine.


    Sent from my iPhone 5

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