WORLDSIM: I have used the worldsim card for over a year now. My conclusions: - incoming roaming quality varies significantly from place to place: -Australia: NOT WORKING WELL. They roam free of charge with optus or vodafone, for a hefty charge with Telstra. However in the northwest vodafone is almost non-existing, optus rather bad and unreliable. -Reunion: NOT WORKING AT ALL -Mauritius: works well free of charge - virtual numbers: I had australian, french, US, and german numbers. After many outages of some or all and the customer service only reacting after 12 hours or more I gave them up. - Incoming calls to the main number (UK special mobile) are generally ok, however this number is VERY expensive to call.So without reliable virtual numbers there is not much use for it. - call forwarding only works reliably to UK landline numbers. ONESIM: 2 months ago I switched to onesim universal with australian, french and UK virtual numbers.No complaints there. In Australia they roam with telstra. Excellent voice quality and very reliable.