All Safaricom subscribers are eligible to make a reverse call. When the person receiving answers the call, they will get an announcement requesting them to either accept or decline by pressing 1 to accept or 2 to decline.
Once they accept, the call will be charged at normal rates. It’s also only available to subscribers within the Safaricom network. To make a reverse call on Safaricom, dial # followed by the number you wish to call.
However, reverse calls don’t apply when you are making international calls or roaming. If the receiver declines the call or doesn’t have airtime, the call will also be unsuccessful.