1. Create a new SMS message and enter the airtime value you want to share, followed by #, followed by the mobile number you want to top-up.
2. Send to 140
3. Wait for confirmation by SMS
4. The person receiving the airtime gets a receipt message on successful top-up.
We just tested it and it works instantly.
For full details click here. Note only Safaricom customers i.e. prepaid can use this service.
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