For Safaricom (63902), if you have very large volumes of 2FA traffic, we recommend you register your sender ID with us to avoid filtering and forcing, this can be done through your account manager.
Numeric sender will be overwritten to "NXSMS" to ensure delivery for all networks.
There are no additional content restrictions beyond those in our Acceptable Use Policy
Other features/restrictions of note:
Delivery Receipts are supported except for Airtel, where they are network receipts rather than handset receipts. There are substantial DLR Delays from the Kenya operators at most times so DLR latency should not be used to measure delivery time.