Forgive me if this thread is not the best choice to ask my question in (and kindly redirect me if need be). I have a Motorola Droid Maxx (not a Razr, not a Maxx 2, just the plain old MDM) which was working fine with T-Mobile up until the last month or so. Now, with no discernable pattern, I am sometimes unable to send texts. Receiving texts is not a problem, and my WiFi and 4G are still fine. I went through a bunch of rigmarole with T-Mo online (the local store had no advice on this issue), but to no avail. Here are the settings I have now... APN: fast.t-mobile.com MMSC:https://mms.eng.t-mobile.com/mms/wapenc MMS: port: 8080 MCC: 310 MNC: 260 APN: Type: default,supl,mms APN: Protocol: IPv4 APN: Roaming Protocol: IPv4 ...in the last 36 hours or so alone, I've lost & regained my texting at least 3 times that I can recall. At this point, I'm considering just using my Droid Maxx as a portable media player (which I'm perfectly fine with) and buying a different smartphone that I know 100% for certain is T-Mobile compatible (preferably as cheap as possible).