I think it’s a long shot for someone to help you book (
hopefully I am wrong)......helping others to book a punt and bare the risk of letting Family knows about it....hmmm.... This is what I would do. Land at the airport and go to the Money changer to get the SIM card. Get the booking done while you are on the Taxi.....only need 15 mins to book 4-5 Punts if you do your research b4 hand. OR if the other half is with you, book it in the toilet (use diarrhoea as excuse and spend 10mins). Few hundred minutes included with enough Data to report back to this forum