Alphanumeric senders are allowed in France. You can send SMS with a name/letters as the sender.
The mobile networks in France all use the GSM character set. All French operators support Unicode except Bouygues. Unicode messages towards Bouygues are translated to GSM. Concatenated SMS are supported in France.
Two Way Messaging
Two-way messaging in France can be configured with long numbers and dedicated or shared short codes. Opt-out is mandatory and dynamic numeric senders are not allowed.
All operators in France support reliable handset delivery receipts for SMS.
There are no restrictions other than those mentioned above and those that prevent abuse (spam, phishing, etc). Bouygues doesn't support Unicode, which is needed for i.e. Emoji.
France has 2 shortcode ranges: 36xxx -> only for marketing messages. 38xxx -> only for otp, alerting and notifications messages (no marketing). Undeclared traffic will be treated as marketing messages.
Traffic through 36xxx is not allowed between 20:30 and 08:00 GMT+1. Traffic through 36xxx is not allowed on Sunday and public French holidays.
When sending marketing messages with alphanumeric sender, the message content must contain instructions for the recipient to unsubscribe. If no instruction is given, CM will add STOP [shortcode] to the message. When using the 36xxx shortcode and a recipient replies with STOP (or equivalent), you are obligated to remove that number from your database. All messages must be sent in French.