iPhone 12 issues

I've long been android user and

this is my first iPhone. It's been couple of weeks using the iPhone 12 Now and I've observed following 3 issues.

1. My very first impression was that screen looks too yellow and dull for my liking and couldn't find any solid solution to this yet.
2. Network connectivity has been really poor. I don't get good network in well connected areas and call keep dropping.
3. Standby battery life is poor. I daily loose 15% + battery at night without doing anything. Last night it dropped 20% which was really annoying.

It's anyone else facing similar issues?