Using your cell phone in Mombasa
The main cell phone service providers in Kenya are Safaricom, Zain, and Orange-Telkom.
SIMs for these providers can be purchased for as little as Kshs. 100 and are widely available from many vendors. As long as your cell phone is not locked into another service provider’s contract and is GSM 900 compatible or tri-band / quad-band, you should be able to use the local lines effectively within Kenya at reasonable rates for international as well as local calls.