Has anyone used a Magic Jack?
yes i have one m my sister in van & other family in alberta/ontario also use it it is great.
Call quality was good. Reasonably easy to setup. I’d recommend them if that’s how you want to roll. 
Do you know if it will work in France
MagicJack is a $40 appliance that’s about the size of two USB memory sticks. You plug any analog telephone into one end, and insert the other end into the USB port of a computer with broadband access. After waiting about one minute while the device self-installs, you can make free calls to any phone in the United States and Canada (no matter where in the world you are) — there are no per-minute charges. After the first year, you pay $20 annually for these calls. That’s not $20 per month, it’s $20 per year.