I have an S20 shooting with the back camera at 4:3 (not 64mb unless it's a landscape or big scenery)
No matter what, it spot-focuses and leaves everything else blurry. Either a fruit, a person, or an A4 page. At the center it's sharp and as you go to the corners it gets blurry.
I uploaded an "Avocado" so that you see what I mean. Every photo comes out exactly like this, no matter what I shoot.
My HTC U11 would keep the shame sharpness from corner to corner.
Yes it's up to date.
This is normal, the aperture is large and it is a big sensor. So you will get bokeh, no matter what.
It is due to depth of field.
It is rather a sign of quality if you ask me... But for some people it may annoy them ; and unlike DSLR, you cannot close the aperture to avoid this.
You can try to play with the AF kind (matrix, spot, etc ...) and see if you can get it better.
Another way would be to place yourself further, and crop the picture afterward...