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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.
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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.