Which numbers can I write to?
The lines accepted for a free send, and those that aren't.
Any French mobile starting with 06 or 07, whatever the carrier (Orange, SFR, Bouygues, Free…). Sending is free in every case.
The service sends for free to French mobiles, that is, ten-digit numbers starting with 06 or 07. The form checks this format before sending.
The answer in detail
06 and 07 correspond to French mobile lines, the only ones able to receive an SMS from the gateway. A landline (01 to 05) or a special number isn't eligible: these lines don't pick up the SMS in the same way.
The format check is instant: a mistyped number, too short or outside 06/07, is refused before it even goes out, which saves you a lost send.
For foreign mobiles, the gateway doesn't handle international routing: the free scope stays national. It's a choice of reliability, a foreign SMS following different routes and rules.
Concrete examples
›A mobile starting with 07
07 12 34 56 78 is a valid format: the free send is accepted.
›A landline number
01 45 xx xx xx is refused: a landline doesn't receive this type of SMS.
Takeaway
Only French mobiles starting with 06 or 07; no landlines, no foreign numbers.
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