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 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?