iPhone 12 Pro Max loses internet connection, Cellular service, trouble making & receiving calls

The phone will drop connection constantly. Have to restart and start the phone. Then it works for a little while, but loses the WI FI Connection. At home I have a 2.4 and a 5.0 WI FI connection, ultimately the phone chooses the 2.4.

Can not make calls from my home, and barely make them while outside or driving. Very annoying. My phone is an expensive paper weight. Dropped calls, unable to make a call without it dropping service or person on other end can't hear me. (No problem with phone volume - all connectivity issues).