I currently operate 3 phones.
I have the phone on my wrist, an LG Watch Urbane 2. Useful for "not intending to use" situations due to the small screen so not for hard to read, hard to type.
I have a 6" phone, OnePlus6.
(as of today) I have a 10.8" phone with keyboard, a Huawei 10.8" with docking keyboard.
All of these have Google Assistant, of which probably the OnePlus6 is the most reliable. All have LTE, of which the OnePlus6 also has the more coverage, most bands.
I think the future of phones is to get the screen fully out of your interaction and make it more exclusively about media. Your interaction will become voice, you talk to it and it talks back, like a super smart person with you. The bigger phones will become your media consumption, to watch things. The human eye has a resolution limit which some displays are at.
I am hinting to this with my watch and the Anker buds, I can interact to a degree, it is less reliable than with the phone and battery life is nowhere near good enough, but I see the hint of where it can get to in 5 years. Basically you are talking with technology to exchange information, or watching a big screen, and little inbetween.
I also repair and keep alive old tech, I have a 1999 Toshiba laptop which still works, and I repaired last year 2012 and 2013 tech which is still used today, which also makes me think we have over-technologized some functions. A 2012 tablet is as good in resolution and brightness as a 2018 tablet.
As for AI, it is going to be initially limited by the "I" part - the programmer, it cannot substitute for a human currently, try doing and you will hit a wall in less than a minute that it is not that intelligent.