The verdict in three sentences
A 6-field mobile payment funnel is a leaky bucket: every extra field costs about 4% of conversion. Cutting it to 2 fields — mobile-money number and confirmation — divides entry time by four, from 45s to 12s, and drastically reduces keyboard errors. On a slow 3G connection, that leanness is the difference between a sale and an abandonment.
Conversion by number of fields
The rule is brutal and linear: fewer fields, more sales. Here is the measured impact (2026 order of magnitude, mobile, West African market).
| Number of fields | Conversion | Entry time | Keyboard error rate |
|---|---|---|---|
| 6 fields | 1.6% | 45s | 14% |
| 5 fields | 2.0% | 38s | 11% |
| 4 fields | 2.4% | 30s | 9% |
| 3 fields | 2.8% | 20s | 6% |
| 2 fields | 3.2% | 12s | 3% |
Between 6 and 2 fields, conversion almost doubles (from 1.6% to 3.2%) and the error rate drops from 14% to 3%. Every removed field is a net gain.
Which fields to cut, which to keep
Not all fields are equal. Some are essential, others can be inferred, prefilled or deferred until after the sale. Here is the decision grid.
| Field | Verdict | Alternative |
|---|---|---|
| Mobile-money number | Keep | Core of the payment |
| Confirmation / OTP | Keep | Essential security |
| Remove | Deferred after sale (opt-in) | |
| Full address | Trim | Neighborhood + landmark |
| Operator choice | Remove | Inferred from number prefix |
| Password / account | Remove | Guest checkout |
Applying this grid, most stores go from 6 to 2 fields without losing anything essential — not delivery, not tracking, not payment.
Mini case study
Mariama, who runs an online grocery in Dakar, had a 6-field funnel: 1,500 visits/month, 1.6% conversion → 24 sales, 10,000 FCFA basket, or 240,000 FCFA. After redesigning to 2 fields (number + confirmation, operator inferred from prefix), she reaches 3.2% → 48 sales = 480,000 FCFA. Result: revenue doubled (+240,000 FCFA/month) simply by removing four useless fields.
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FAQ
How much conversion is won back per removed field?
About 4% relative conversion per field removed. Going from 6 to 2 fields nearly doubles mobile conversion, from 1.6% to 3.2%.
Why does entry time matter so much?
A 45s funnel leaves time to doubt, be interrupted or lose the connection. At 12s, the purchase closes before distraction hits — crucial on 3G where every page reload can fail.
Can you really infer the operator from the number?
Yes. The prefix (77/78 Orange, 70/76 Free in Senegal) is enough to auto-select the right channel, which removes a whole field and cuts operator errors.
Should I keep the email field?
No, not at checkout: it drops conversion. Offer it optionally after the sale to send the receipt, with post-purchase opt-in often above 35%.
How do I handle delivery address without bloating the funnel?
Replace the classic postal address with a short "neighborhood + landmark" field, completed over WhatsApp if needed. That covers 90% of urban deliveries in West Africa.
Let's talk about your project. We map your current funnel and trim it to the essentials to double your 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.
