Deliverability is the simplest promise to make and the hardest to keep. In Africa, it depends on a tangle of carriers, regulations and technical routes that vary from one country to another. The good news: most losses come from a small number of causes you can act on.

1. Direct routes rather than grey routes

A direct route to the destination carrier delivers stable deliverability and reliable delivery receipts. Cheaper "grey" routes sacrifice traceability and expose you to sudden blocks. For critical messages — OTP, alerts — the direct route is not optional.

2. A recognized sender ID

The sender ID (Sender ID) must be registered with the carriers wherever it is required. An unregistered Sender ID is often rewritten, delayed or rejected. Anticipate registration times, which vary by market.

On regulated markets, Sender ID registration is the number-one deliverability factor — even before route quality.

3. The right encoding, the right length

An accented character or an emoji switches the message to UCS-2 encoding, which reduces a segment from 160 to 70 characters. The result: split messages, more expensive and sometimes badly reassembled. Mastering encoding means mastering cost and readability.

4. Controlled sending windows

Sending 100,000 messages in one burst saturates carrier queues and triggers throttling. Smoothing sends over a suitable window improves the delivery rate and reduces perceived latency.

5. Cross-channel fallback

When an SMS does not get through, automatic fallback to WhatsApp or voice saves the message. This cascade, configured upfront, turns a silent failure into a successful delivery on another channel.

  • SMS → WhatsApp for connected users;
  • SMS → Voice for areas with low data coverage;
  • Time thresholds to trigger the fallback at the right moment.

6. Cleaning your databases

Invalid, duplicate or unsubscribed numbers drag down the statistics and waste budget. Upstream validation (format, country code, status) mechanically improves the reported deliverability rate.

7. Continuous measurement

You only improve what you measure. Track the delivery rate per carrier, the median latency and the failure rate by reason. These three indicators immediately reveal where to act.

The three numbers to watch

  • Delivery rate: share of messages confirmed delivered (positive DLR).
  • Median latency: time between sending and delivery.
  • Failure rate by reason: to tell a route problem from a database problem.

At FasterMessage, these seven levers are built into the platform: direct routes, Sender ID management, cross-channel fallback and a real-time dashboard. That is what turns an intent to send into a message actually received.