your benefit If you use your own GSM-SIM-Card in foreign countries you have to pay much more for all, ´cause you are a visitor there. Incoming calls may be charged from EUR 0,60 up to 3 EUR per minute. Also outgoing calls in exotic regions can reach EUR 6 - per minute of course (see GSM-Roaminglist). Do you use instead a foreign mobile Number, it will be cheaper than with your own card. Incoming calls usually are for free. you can also forward your callback-account to your foreign number to take benefit of this cheap connection without fees for incoming calls.