I bought a 16GB Nexus 5 directly from Google and I put my T-Mobile SIM card in the phone. I can make/receive phone calls, send/receive text (SMS) messages, and use the internet no problem. However, I have two problems which I did not have on my old phone:

    1) My phone keeps flip-flopping between 3G and 4G every few seconds.

    2) I am unable to send MMS messages

     

    From what I have gathered, this could be due to the "APN" settings.

     

    I looked in my phone, and here is what I have...

    APN: fast.t-mobile.com

    MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc

    MCC: 310

    MNC: 260

    APN type: default,supl,mms

    APN protocol: IPv6

    APN roaming protocol: IPv4

     

    Are these settings correct? If these settings are correct, what else could be causing my problems?

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