I would go all cell phone if I got good reception at my house. I can stand outside on either my front or back porches and get reception, but not IN my house.
But, one thing you need to remember, if you have a corded landline phone, it will work in the case of an electrical outage, wonky satellite, hurricane, etc. So, if you NEED a phone for any reason (medical, your job, etc.) you may rethink going only cell or only internet.