A number in 06 or in 07

Two prefixes for one and the same type of line.

06 and 07 both refer to a French mobile. Their only difference is historical: 06 was opened first, then ARCEP added 07 when numbers in 06 began to run short. Technically, an SMS or a call behaves strictly identically towards both.

In summary

06 and 07 both correspond to French mobile lines.
07 was opened because the reserve of numbers in 06 was running out, not to mark a category of subscribers.
Including the prefix, a French number is made up of ten digits.
Neither of the two prefixes reveals the holder's carrier.

Believing that a 07 would be a number of lesser value, tied to a virtual operator or a low-cost offer, is an unfounded shortcut. Blocks of numbers are first allocated to operators by the regulator, then distributed among their subscribers; the same operator holds blocks in both 06 and 07.

This confusion feeds on another, even more stubborn shortcut: the idea that a prefix would reveal the network. That was partly true before number portability. It is no longer: a subscriber can change operator while keeping their number, and commonly does. As a direct consequence, a number says nothing about its holder.

To send an anonymous SMS, the conclusion is clear: nothing else to know but the ten digits. The form accepts either prefix, and routing to the right network is determined automatically, without you having to mask or specify anything more.