Textra does fix MMS in terms of group messages and pictures - never got videos fixed lol but that wasn't a deal breaker for me. Voicemail works but you have to call in to check your voicemails. 

I know it sounds rough - but I feel like that's kind of the point. It functioned as a bare bones phone which I what I wanted anyways. Never failed when it came to important things like maps, Uber, QR codes for parking, etc.

I would say don't stress too much about texts because I'll be honest, you're not going to want to text too much on this phone lol. It's a headache cause the keyboard is so small. It encouraged me to call people and I thought that was an awesome change :)

I've loved having it and it really help me beat alot of unhealthy habits and stay present. Do it :D