As an alternative to the VoIP phone: Redpocket has a $2.67/mo plan. We loaded that SIM into a small android phone (Unihertz Jelly phone).

It works great as a home phone but has the additional advantage of being able to wander if a pre-cellularized needs to go somewhere. For example, my 13-year-old takes it when going on a long bike-ride with his friends.

We keep it in our closet and only comes out when needed. They aren't allowed to give the number out to friends.