The main languages spoken are Swahili and English. Locals appreciate any Swahili you can speak!
The local currency is Kenyan shillings. U.S. dollars, Euros, and credit cards may be accepted by larger stores and hotels, but the exchange rate is better with shillings.
US$100 bills must be 2003 or later, or they will not be accepted. For travellers cheques, there is often a $1/cheque fee, and the exchange rate is better for US$100 cheques. It helps to bring smaller bills as change is not always available.
All of the major international credit cards are accepted in Kenya and most ATMs can accept international Visa and Mastercard credit cards. Your best luck at finding an ATM will be in the larger cities, such as Nairobi and Mombasa. Travelers checks are readily accepted at most hotels and other service providers.
When calling Kenya, you must dial the country code of 254.
Only global cell phones will work and only in the bigger towns. You may want to consider renting one or getting a satellite phone.
Kenya uses 220 volt current with a U.K. or European plug. On safari, many hotels are on generators or solar power, so electricity may not run all day and all night.