A friend of mine, a medical student, will be spending about a month in Kenya. She's quite keen to phone home on a regular basis. I've done some preliminary research and turned up two different Kenyan GSM carriers: KenCell and SafariCom. Both operate at 900MHz. I've got an old Ericson T28 World that should make a perfect phone for her to use (assuming she's anywhere near a cel tower -- most of the country has no service).

My question, which neither the local Kenyan embassy nor any web pages have been able to satisfactorially answer, is how she can use my spare phone in Kenya. In particular, I'm curious how she goes about getting a SIM card that will get her a local Kenyan phone number. The web sites for both firms talk about "scratch cards", which appear (so far as I can tell) to be single-use numbers that you punch into your phone to enable pre-paid phone service.

Anyone with any experience in these matters?