With International Roaming facility in your SIM card, you can use your mobile phone while you are visiting foreign countries. Your mobile phone number remains the same and you can make or receive calls to/from any where around the world. Further, you can also use additional services which are available in your home country while you are abroad. There are two ways of International Roaming: Outbound Roaming and Inbound Roaming. And the service is now available for both post-paid as well as pre-paid customers.