If you are using Dhiraagu Mobile Service and travelling to Sri lanka then you have good roaming rate.
You should select Dialog as the operator when you reach Sri Lanka, you can make and receive calls at the rate of MRF 9.50 which is very cheep when compared to the usual roaming charges.
Now Dhiraagu has International roaming in pre activated in pre paid connections, but I don’t think many use this service as the International roaming rates are so high. I was using it earlier when I was travelling, but these days I try to avoid and use a local SIM card instead.

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