[niyaven]

Disclaimer: not Indian but living in India and I've not attempted to perform this hack. But if I'm not mistaken a SIM swap procedure is the similar to asking for a new SIM.

For Vodafone India, in addition to traditional info (date of birth, passport number, address), they actually asked me to give the number of someone whom I've called with this SIM, then they called that person and asked them to verify my identity. I found this to be quite secure.

But maybe the procedure is different for foreigners (at least the SIM creation procedure is different).