Dropped calls

Hi, new to Telus..I have a LG G7 one and calls are constantly dropped. I call once, call gets dropped, I call back and it's fine. Becoming increasingly frustrating as I am on the phone all the time.
I have gone into store and had my sim card switched but that didn't work. Any suggestions other than returning phone to store?
Calls drop when I'm in my car and when I'm in my house.