The verdict in three sentences
SMS and WhatsApp aren't interchangeable once you divide by conversions. In Kampala, SMS costs ~25 FCFA/message but converts little, while WhatsApp costs ~45 FCFA/conversation and opens at 80% with images and replies. Per recovered sale, WhatsApp costs ~350 FCFA versus ~1,100 FCFA for SMS.
The cost-per-message trap
Comparing channels on cost per message misleads. SMS looks 45% cheaper, but its 4% click rate and lack of rich media collapse conversion. What matters is cost per actually recovered order.
| Criterion | SMS | |
|---|---|---|
| Cost/message | ~25 FCFA | ~45 FCFA |
| Open rate | ~90% (received) | ~80% (read) |
| Click rate | ~4% | ~18% |
| Rich media | No | Yes (images, buttons) |
| Two-way reply | No | Yes |
| Recovery conversion | 6-9% | 18-26% |
| Cost/recovered order | ~1,100 FCFA | ~350 FCFA |
WhatsApp costs almost double per message but a third of the cost per conversion. The gap comes from click rate (4x higher) and two-way conversation.
The hybrid rule: WhatsApp first, SMS fallback
Not every number is on WhatsApp. The optimal strategy sends WhatsApp first, then falls back to SMS only for numbers unreachable on WhatsApp. This approach cuts blended cost per conversion by ~40%.
| Approach | Blended cost/conversion | Number coverage |
|---|---|---|
| SMS only | ~1,100 FCFA | 100% |
| WhatsApp only | ~350 FCFA | ~75% |
| Hybrid (WA + SMS fallback) | ~650 FCFA | 100% |
The hybrid covers 100% of the base while keeping cost per conversion well below SMS alone. It's the benchmark for serious recovery in Kampala.
When SMS keeps a role
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SMS stays useful for off-WhatsApp numbers, short transactional alerts (OTP code, confirmation) and low-data-connectivity zones. On marketing recovery, however, it can't compete: its cost per conversion is structurally 3x higher.
Mini case study
Moussa runs a clothing shop in Kampala: 400 abandoned carts/month. SMS only: 400 x 25 FCFA = 10,000 FCFA in messages, ~7% recovered = 28 orders, cost/conversion ~1,100 FCFA. Hybrid: WhatsApp on 300 numbers (75%) + SMS on 100. Cost: 300 x 45 + 100 x 25 = 16,000 FCFA. Recovery: 300 x 22% + 100 x 7% = 66 + 7 = 73 orders. Blended cost/conversion: ~220 FCFA. He recovers 2.6x more orders for a cost per sale divided by five.
FAQ
Which channel has the best cost per conversion? WhatsApp, by far: ~350 FCFA per recovered order versus ~1,100 FCFA for SMS in Kampala, despite an almost double cost per message.
Why does SMS convert so little? ~4% click rate, no rich media, no reply possible. On cart recovery, it caps at 6-9% recovery versus 18-26% for WhatsApp.
Should you drop SMS? No: it stays essential for the ~25% of off-WhatsApp numbers and short transactional alerts. As fallback, it ensures 100% coverage.
How much does the hybrid save? WhatsApp-first, SMS-fallback cuts blended cost per conversion by about 40% versus SMS alone, while covering 100% of the base.
What does a WhatsApp Business conversation cost? Around 45 FCFA per initiated conversation in Kampala in 2026 (order of magnitude). That cost is largely offset by a conversion rate 3 to 4 times higher than SMS.
Let's talk about your project. We'll set up your hybrid WhatsApp + SMS-fallback recovery and measure your real cost per conversion. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
