How to Add Phone Number and OTP Login to Shopify
Actionable, tested steps — plus the Shopify apps that make it faster, with honest notes on pricing and fit.
Shopify’s customer accounts only support email login natively — there’s no phone-number or OTP option built in. To add it, use an app like OTP+ (4.8 stars): customers sign in with their phone number via a one-time password over SMS or WhatsApp, or with Google/Apple social login, and the same OTP verification can run at checkout to stop fake and cash-on-delivery orders.
Why phone login beats passwords for stores
Every login hurdle costs you customers. Passwords get forgotten, reset emails land in spam, and a meaningful slice of shoppers simply give up rather than recover an account they made once, eight months ago. Phone-number login with a one-time password removes the whole failure chain: the customer types the number they know by heart, gets a code, and they’re in. In markets where WhatsApp and SMS are the default identity layer — much of Asia, the Middle East, Latin America — phone login isn’t a nice-to-have, it’s what customers expect.
There’s a second, less obvious benefit: verified phone numbers clean up your order book. More on that below, because for cash-on-delivery stores it’s usually the bigger prize.
What Shopify supports natively
- Email-code login — Shopify’s new customer accounts send a six-digit code to the customer’s email. Better than passwords, but still email-bound.
- No phone-number login. There’s no native way for a customer to authenticate with their mobile number.
- No checkout verification. Nothing natively confirms that the phone number on a COD order is real and answered.
Step-by-step: adding OTP login
We’ll use OTP+ Phone, SMS & Social Login (4.8 stars — full breakdown in our OTP+ review):
- 1. Install and pick your channels. SMS and WhatsApp are the workhorses; WhatsApp delivery is often faster and cheaper in the markets where phone login matters most.
- 2. Enable social login alongside. Google and Apple sign-in cover the shoppers who prefer one-tap login over codes — offering both maximizes coverage.
- 3. Style the login screen. Match your brand so the login feels native rather than bolted on.
- 4. Turn on checkout OTP if you take COD. This is the fraud lever: the order only goes through once the customer confirms the code sent to their number.
- 5. Test the full journey. Register, log out, log back in, and place a test COD order — confirm codes arrive fast on both SMS and WhatsApp.
The COD problem checkout OTP actually solves
If you run cash on delivery, you know the pattern: orders placed with fake numbers or by people who never intended to accept delivery. Every one of those is a courier fee out, a courier fee back (the dreaded RTO — return to origin), packaging, and handling — all spent on revenue that never existed. Checkout OTP kills most of it at the source: no verified phone, no order. Combined with traffic-level filtering (see our guide to blocking countries, IPs, and bots), you’re verifying both who visits and who orders.
Will OTP hurt conversion?
The honest answer: it adds a step, so place it deliberately. For login, OTP usually beats the alternative — it replaces password recovery, the single worst flow in ecommerce. For checkout, enable verification where the economics demand it (COD orders, high-RTO regions) rather than on every prepaid card order from a returning customer. Used that way, the step pays for itself many times over in cancelled-order savings.
Measuring the impact
Watch three numbers for the first month: account-creation completion rate (should rise once passwords are gone), COD confirmation rate, and RTO percentage. RTO is where the money is — each point of improvement is real cash, not vanity metrics.
Recommended apps for this
The tools we’d reach for — each links to its Shopify App Store listing.
OTP+ Phone, SMS & Social Login
Passwordless phone-OTP + Google/Apple social login, plus checkout OTP to cut fake/COD orders, RTO and chargebacks.
Securify ‑ Block IP & Country
When fake orders, bots from cheap data centers and content scrapers hit your store, you pay for ads that never convert. Securify…
Frequently asked questions
Does Shopify support phone number login natively?
No. Shopify’s customer accounts authenticate by email (a code sent to the customer’s inbox). Phone-number OTP login — and social login with Google or Apple — requires an app like OTP+.
What is checkout OTP and why use it?
Checkout OTP sends a one-time code to the customer’s phone before the order is accepted. It’s the standard defense against fake cash-on-delivery orders: no verified number, no order — which directly cuts courier losses from returned shipments (RTO).
Does OTP work over WhatsApp or just SMS?
OTP+ supports both SMS and WhatsApp delivery. WhatsApp is often the better channel in COD-heavy markets — delivery is fast and customers actually see it.
Will adding OTP reduce my conversion rate?
Applied bluntly, it can — so apply it surgically. Use OTP for login (where it removes password friction rather than adding any) and for COD checkout verification. Skip it for prepaid orders from returning customers unless fraud says otherwise.
Is phone login secure?
It’s meaningfully better than passwords for most shoppers: nothing to reuse, leak, or forget. Each login is confirmed against physical possession of the phone, and verified numbers make every downstream order more trustworthy.