I think that $10US/day for phone service is outrageous, but if it is that important for others to be able to reach you without their being forced to dial a different phone number, it is a solution. I rather dislike the potential of my phone ringing in the middle of the night in France just because a US telemarketer thinks that I am likely home at the diner table.
Many people now use VoIP, be it Signal, Telegram, Whatsapp, google talk, there are many options. These, along with real time mapping, email usage, and informational research require data. The last time I came through CDG terminal 1, Orange had a booth selling SIMs and configuring phones right at the Customs exit. I have not seen them at terminal 2 customs, but there are many places to purchase a SIM at CDG, any of the many Relay stores for example.
T-Mobile's customers now have upgraded data services while traveling, offering them 4G speeds at no additional cost. All they need worry about are the pesky calls in the night.