For those of you who use Airtel sim cards, be aware that you could receive promotional texts and calls for which you might get charged, especially if you go onto a roaming tariff (if you use the sim outside Goa). I went to Bangalore on the 11th December for 5 days and kept getting texts and calls with rubbish music, which when terminated came up with a message telling me that I had been charged! Both Airtel Bangalore and Airtel Goa washed their hands of all responsibility so there was no come back. I'm not sure if this happens in Goa (I think it did on one or two occasions with the music) but certainly not with the same frequency.