# How Long Is a Phone-Number Sign-Up Flow?

Source: Lazyweb Research
Published: 2026-07-07
Sample size: n=12
Tags: signup, onboarding, ux-patterns, mobile
HTML: https://www.lazyweb.com/research/phone-signup-flow-length
Markdown: https://www.lazyweb.com/research/phone-signup-flow-length.md

**Answer.** Across 12 tracked phone sign-up flows, the median is 7 screens and the average is 7.3 [1] — slightly longer than email/username sign-up (median 6, n=87) [2]. Lengths range from 2 to 14 screens [1]. The extra step is typically OTP verification. This is a small sample, reported with explicit n.

> Phone sign-up runs a median 7 screens vs 6 for standard sign-up — about one extra step for OTP (n=12 flows, July 2026).

## The finding: about one screen longer than standard sign-up

Phone sign-up flows (exact-name 'sign up with phone', 12 flows) average 7.3 screens with a median of 7 [1]. That's roughly one screen more than standard sign-up (median 6) [2], consistent with adding a phone-entry and OTP-verification step. The 2-14 range [1] shows some apps keep it minimal while others layer in profile setup.

## Phone sign-up in context

| Flow type | Flows | Avg | Median |
|---|---|---|---|
| Sign in | 110 | 4.5 | 4 [3] |
| Sign up | 87 | 6.3 | 6 [2] |
| Sign up with phone | 12 | 7.3 | 7 [1] |
| Onboarding | 129 | 13.9 | 11 [4] |

Phone sign-up sits just above standard sign-up, well below onboarding.

## How to apply it

If you're adding phone/OTP sign-up, budget ~7 screens and treat the OTP step as the one unavoidable addition over email sign-up. Keep the rest lean — the data shows no need to exceed the low-teens. Because n=12 is small, use this as a rough planning anchor and validate against your own completion rate.

## The numbers

| Stat | Computed from |
| --- | --- |
| sign up with phone 12 flows avg 7.3 median 7 range 2-14 | flowtype_sign_up_with_phone |
| sign up 87 flows avg 6.3 median 6 | flowtype_sign_up |
| sign in 110 flows avg 4.5 median 4 | flowtype_sign_in |
| onboarding 129 flows avg 13.9 median 11 | flowtype_onboarding |

## Methodology

Universe: 2,468 tracked flows; phone sign-up (12), sign up (87), sign in (110), onboarding (129) by lower(flow_name). Small sample (n=12): median and range with explicit n, no percentages. Screens per canonical flow.

## Sources & citations

- [1] Lazyweb Research analysis of 12 phone sign-up flows (subset of 2,468 tracked flows), July 2026. Exact-name 'sign up with phone'; small sample, reported with explicit n.
- [2] Lazyweb Research analysis of 87 sign-up flows (subset of 2,468 tracked flows), July 2026. flow_name containing 'sign up', excluding phone variant.
- [3] Lazyweb Research analysis of 110 sign-in flows (subset of 2,468 tracked flows), July 2026. flow_name containing 'sign in'/'log in'/'login'.
- [4] Lazyweb Research analysis of 129 onboarding flows (subset of 2,468 tracked flows), July 2026. LIKE '%onboarding%'.

## Related questions

- [How Long Is Onboarding Compared to Sign-Up?](https://www.lazyweb.com/research/onboarding-vs-signup-flow-length)
- [How Long Is Onboarding Compared to Sign-In?](https://www.lazyweb.com/research/onboarding-vs-signin-flow-length)
- [How Long Is Onboarding Compared to a Paywall Flow?](https://www.lazyweb.com/research/onboarding-vs-paywall-flow-length)