Poor signal in my house

[KerryCRNA]

I live in an area with alledged good service but in order to make or receive calls on my S 9 plus I have to run outside and stand on the ledge to make or recieve a call, not too happy with this.  I can get and recieve text’s in the house.  I’d like to get rid of my landline but the Verizon signal is unreliable, help