We arrived in Santiago yesterday evening and when we tried to buy a SIM card at the airport we were told that we needed to pre-register our mobile phones first which you can't do on the spot. Looks like a recent thing.
Does anyone have experience with this? Does the process take long? Can I have it done at any shop or even better can it be done online?
Any help is welcome. We are leaving to Easter Island in 2 days so where hoping to get it done asap.