Simply swap your existing SIM card for GeoSIM Global SIm Card and switch on your phone. Your GeoSIM will then lock on to the strongest local GSM mobile phone network and youre ready to make and receive calls!
GeoSIM works slightly differently from your "normal" SIM. When making a call, GeoSIM routes your dialing instruction away from the local operator and sends your call to the GeoSIM "Hub". A few seconds after you dial the number you want to call, your mobile phone will ring. You answer the "callback" and you will be connected to the person you wish to talk to.
In summary:
You will only be charged from when your call connects to the number you are dialling, not from when you receive the call back like some other Global SIMs do.