When you take your mobile phone abroad, your phone “roams” onto overseas mobile networks enabling you to continue using your mobile phone similarly to as you would in your country. However with your existing operator there may be significant extra costs for calls, voicemail, and data services. When you move between countries, 360travelsim will move seamlessly with you, picking up a new network as soon as you arrive in a new destination, enabling you to make low cost calls the moment you step off the plane.