Callkeyone

[Przemolog]

Originally Posted by Jibku

Maybe part of your problem comes from the fact that in France, callback doesn't work on all networks.

You can receive calls on any of the 3 french networks (Orange Fr, Bouygues Telecom and SFR), but you can send calls only when you're connected to Orange Fr. On the two others, callback never comes.

It's quite possible what you say. But, AFAIK it shouldn't affect "Manx-based" SIMs as well as Travelsim, since they use SMS-based callback if USSD-based (default) callback fails.