A client for inclusion in a mobile telephony apparatus barred from international roaming usage, to allow roaming operation thereof according to conditions determined at a home network, the client being configured with: an activation unit configured to switch said client between active and passive states, and a call control unit, operative in said active state, to communicate with a predetermined node at said home network, to facilitate control of said mobile telephony apparatus using said home network determined conditions. There is also provided a server component at the home network to support the client. The system allows CAMEL type services when a prepaid roaming user is roaming in a non-CAMEL enabled network, and even allows these services to be provided when the home network lacks CAMEL enablement.
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