I got one after reading good things about it. The default OS plainly doesn't work. It's not that it's slow or that it crashes. It's that it's totally unpredict

I got one after reading good things about it. The default OS plainly doesn't work. It's not that it's slow or that it crashes. It's that it's totally unpredictable. Things pop out from no where, you get error alerts from things you don't know. I couldn't figure out how to make my sim card work... Then I installed Ubuntu touch. It's way better, but still I couldn't make the phone work. I received a text at some point, and then I had to take care of my kid and I didn't pick it up since...