One thing I would suggest, even if it's a simple trak phone with limited minutes ... think seriously about getting a second connection to the world... With all your connection to the outside world coming thru one service, if that service goes down for some reason you are without the ability to contact anyone.
My daughter worked for a short time as a tech rep for U-Verse ( phone help). She had a customer with this exact issue. Elderly woman who was talked into getting her phone thru U-Verse also. Service went down and she had to walk down to a neighbor's house using a walker, to borrow a cell phone with limited time on it to call tech support.