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Thread: t-mobile hotspot fails with unlocked Samsung S3

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    t-mobile hotspot fails with unlocked Samsung S3

    I bought a used unlocked GSM Samsung S3. I like it very much, everything works well except for one thing: I cannot make any hotspot app work. I get the message "Mobile data is not available or invalid SIM." I have googled this message and it seems to be related to the fact that the phone was originally an AT&T phone, not a t-mobile phone. So even though it is unlocked, something is still locked to AT&T. I went to a t-mobile store and they told me to buy a new phone! I'd appreciate any advice. I do not want to root my phone.

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    Are you hotspotting within the official terms of your plan, or are you trying to bypass T Mobile's restrictions?
    Which hotspotting apps have you tried?
    What have you got against rooting?

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    Quote Originally Posted by HansCT View Post
    Are you hotspotting within the official terms of your plan, or are you trying to bypass T Mobile's restrictions?
    Which hotspotting apps have you tried?
    What have you got against rooting?
    1. Within official terms of plan. On my old phone (HTC-One) on the same plan, t-mobile hotspot worked fine.
    2. In addition to t-mobile hotspot, I tried FoxFi, HotSpot widget, OpenGarden, Wifi Hotspot tether.
    3. If I knew for sure that rooting would work, I'd do it. But rooting is complicated for a naive user like myself.

    thanks.

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    Quote Originally Posted by school-tech View Post
    I bought a used unlocked GSM Samsung S3. I like it very much, everything works well except for one thing: I cannot make any hotspot app work. I get the message "Mobile data is not available or invalid SIM." I have googled this message and it seems to be related to the fact that the phone was originally an AT&T phone, not a t-mobile phone. So even though it is unlocked, something is still locked to AT&T. I went to a t-mobile store and they told me to buy a new phone! I'd appreciate any advice. I do not want to root my phone.
    Most Hotspot issues I have encountered are due to incorrect APN settings.

    Here is T Mobile APN Settings. Also Make sure you input the apn type correctly that can cause issues with the hotspot as well.

    Name: T-Mobile
    APN: fast.t-mobile.com
    Proxy: <Not set>
    Port: <Not set>
    Username: <Not set>
    Password: <Not set>
    Server: <Not set>
    MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
    MMS proxy: <Not set>
    MMS port: <Not set>
    MMS protocol: WAP 2.0
    MCC: 310
    MNC: 260
    Authentication type: <Not set>
    APN type: default,supl,admin,dun,mms

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