Results 1 to 10 of 10
  1.    #1  
    Dumb question?

    I am new to the wonderful world of GSM. I have been with Sprint for so long I have to adjust to this all.

    SO, if I buy a new GSM smartphone (or any GSM phone for that matter), ALL i have to do is slide my SIM card in and I am off the races? No other sticking points? My plan continues as signed? Text, PDA, etc.?

    I am so stoked to try this whole world of different GSM smartphones. It will be great if its as easy as it seems...

    Thanks
  2. #2  
    The simple answer is yes... and no.

    With GSM, if you buy a phone from a carrier, it is typically pick-locked to that carrier and will not work with another carrier's SIM.

    However, GSM phones that have been locked can be unlocked to work with any SIM. If you've been with your carrier for a while, you can usually call them up and they will give you the unlock code. Then just jam in a different carrier's SIM and enter the unlock code when prompted.

    Some phones you can unlock yourself with a simple web download, and some others you may have to send off to an unlocking service for a small fee (usually about $20).

    Of course, you can always purchase an unlocked phone from the start. Take a look on ebay for "GSM unlocked" and you'll find quite a selection. Or if you want it new, you can purchase unlocked phones direct, but they will typically be full retail price as there is no service contract to offset the purchase.
    Treo 750 | AT&T | WM6| TREO750-2.27-RWE | FW 1.54.01.00

    My Treo freeware apps - http://slicktools.itrello.com
    My favorite software picks - http://slicktools.itrello.com/750-picks.html
  3. CDG
    CDG is offline
    CDG's Avatar
    Posts
    467 Posts
    Global Posts
    2,003 Global Posts
    #3  
    To add to the excellent detailed and informative reply given by faslerner - let's say you are on at&t and you buy a T-Mobile branded and unlocked device or an unbranded or unlocked one, your device will work for voice & text as soon as you put your at&t SIM card in but you will have to configure it for MMS & web access. Typically these settings are readily accessible
  4.    #4  
    Thanks.

    So if i buy an unlocked smartphone from a place like:

    http://www.expansys-usa.com/h.aspx

    I can use the sim? Are there any "foreign" phone concerns. Will a UK unlocked phone work here?
  5. CDG
    CDG is offline
    CDG's Avatar
    Posts
    467 Posts
    Global Posts
    2,003 Global Posts
    #5  
    Quote Originally Posted by kiwisholland View Post
    Thanks.

    So if i buy an unlocked smartphone from a place like:

    http://www.expansys-usa.com/h.aspx

    I can use the sim? Are there any "foreign" phone concerns. Will a UK unlocked phone work here?
    Yes, you can use your SIM in a Smartphone from a place like that. No difference on how and where it was unlocked. Like I mentioned before you will have to do the settings for mms & web access, your SIM will not take care of that since the settings reside in the phone itself.

    Hope this helps.

    PS: As long as the Smartphone has the US frequencies of 850/1900.
  6. #6  
    If you travel outside the US, go for a quadband "worldphone" as it should be able to utilize all the common GSM frequencies domestic and abroad.
    Treo 750 | AT&T | WM6| TREO750-2.27-RWE | FW 1.54.01.00

    My Treo freeware apps - http://slicktools.itrello.com
    My favorite software picks - http://slicktools.itrello.com/750-picks.html
  7.    #7  
    Thanks fellas!
  8. #8  
    When I ordered new upgrade GSM phones from AT&T (not Treos) they all came with a new SIM and instructions to activate. When I put the old AT&T SIM into the new phone it was not recognized. Is this purposely done by AT&T?

    Wizbang
  9. eugarps's Avatar
    Posts
    139 Posts
    Global Posts
    161 Global Posts
    #9  
    It may depend somewhat on how old your 'old' SIM is. I Don't think some of the more modern phones work with older SIM's.

    That said: I just sold my iPhone on eBay and came back to my GSM Unlocked Treo 750. I had to call AT&T and set up a new PDA plan but the SIM did not change.

    The Treo 750 is a quad band phone and works about everywhere. I had some issues in Thailand with my old Treo 650 but after swapping the SIM into my old HP hw6945, I hooked up just fine. It must have had something to do with the way the two phones (one Palm and one WM OS) handled the networks. I think Thailand uses one band to receive and another to transmit or something like that. Thus, it's VERY good anvice to buy a quad-band phone. I also understand that GSM 3G is pretty widespread overseas.
    Best,

    Bill
    ><(((((`>
    Palm Treo Pro, iPhone 3G 16GB Refurb, Palm TX
    Waiting for Pre GSM!
  10. #10  
    Phones through a carrier are pick locked to their SIM. It's possible if your old SIM is Cingular that it actually may not work on a brand new AT&T device.

    Either way, just activate the new sim. The newer ones are typically for 3G and have more storage space also. You should be able to go into any store and have them copy your stored data from sim to sim.
    Treo 750 | AT&T | WM6| TREO750-2.27-RWE | FW 1.54.01.00

    My Treo freeware apps - http://slicktools.itrello.com
    My favorite software picks - http://slicktools.itrello.com/750-picks.html

Posting Permissions