Major hotels and ISD available in the markets offer the service of international dialing. Dial 001 plus the country code plus the area code plus the phone number if you wish to make an international call. The service is reliable and not that costly. Port Blair and some parts of Havelock Island have excellent mobile connectivity. In other islands, you may find the service but it will not be that good. At present, BSNL, Airtel, Reliance, and Vodafone are available there.
Port Blair and Havelock Island have internet facility. Connectivity in the capital town is quite good with fast connections. In Swaraj Dweep, the internet facility is very slow as it is on dial up connections. The facility of satellite internet is available in some places that is faster but more expensive. So many islands don’t have internet services at all.