Phone Cameras (But not huge ones...)

Rather than get a new(er) body for my elderly Canon dSLR, I am coming to the conclusion that I would probably get more use out of a phone with a decent camera. Unfortunately, it seems that the only phones with stabilised lenses and physical zooms are the top-end ones like the Apple / Pixel Pro and the Samsung S-Ultra. They would be out of my price range except that 2 year old refurbished ones are coming in at sub-£300 now.

Catch is, that they are absolutely huge. I need something I can carry with me in a jacket pocket and also not be one of those people who looks like they are about to eat their phone like a Jacobs cracker when they talk on it. The reality is that I probably wouldn't take a big phone with me - I already have a DSLR to not carry with me after all. I'm just going around in circles with reviews, most of which seem to be paid for by the manufacturer or marketing company.

There doesn't seem to be anything between generic image sensors and the premium ones. I need something more than a full-auto camera, preferably something that has low noise for night / sky photos, and is decent for taking landscapes and architecture. Do any of you have current pet favourites?

Cheers!

ETA: I've been bitten by Apple products too many times, so it is unlikely to be an iPhone.

It is probably wrong to look at this as a "Phone replacing a DSLR". It is very much a "Phone replacing another much older phone and want the photos to look as un-crap as possible". From my point of view it is more along the lines of having a budget of maybe £300, and working out where I can get most bang for my buck. I also need a new(er) phone - I mean, I can't even play Pokemon Go on this any more

Thanks for the heads-up on Asus Zenphones. I didn't even know they existed!