Since the raspberry came out, we can produce pocket-sized computers with touch screens and cameras fairly easily. These are ALMOST smartphones. So why can't we have a raspberry based smartphone?
To me it looks like the problem is around GSM/4G and battery, since pretty much everything else is easily supported by a raspberry pi.
I could cope with Pine phone literally crashing all the time, but I could not cope with the fact that I was not able to place/receive a single call or text message.
Right now, I'd be happy just having a pocket computer with call/4g functionality.