Cheap android phone with big screen

[aww999]

My galaxy S4 has been everything I've needed for the last three years, but something's got mangled inside and now it either restarts itself or says "simcard removed" every time I move it or touch it. I really don't need anything faster or more powerful, although more storage space would be handy. What would be really useful is a bigger screen, something like a 5.5" or bigger, as I mainly use it for browsing, Kindle and youtube. I don't really want to pay £600 for a new S7E or similar, a second-tier phone would be absolutely fine I think! However, I want to be sure that I can use Android Auto (maps and spotify) and I'd rather have something new than second hand. I absolutely loath buggering about with menus and settings and things, I just want it all to work reliably!

A bit of internet research suggests brands I've never heard of like the OnePlus 3T (about £400) or even the UmiDigi Z at about £200 (link here https://www.amazon.co.uk/UMIDIGI-Smartphone-Deca-c...

What, if anything, will I lose by going for one of these things instead of a high-street brand like a Samsung? Any advice or recommendations much appreciated.

[aww999]

Thanks for all the advice chaps. I ended up going for a Lenovo P2, it's much faster than the old S4 and the Android Auto interface is much more reliable. Battery life seems superb as well, I can just leave GPS and Bluetooth on all the time instead of switching them on and off.