# SMS OTP vs email OTP

> **Verdict in brief:** Neither is strong. SMS codes are exposed to SIM swaps; email codes to mailbox takeover. Both can be phished and read out to an OTP bot. Regulators treat them as one class of risk: the UAE and the Philippines retired both together. Switching from one to the other is not a security upgrade.

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**A. SMS OTP:** A one-time code sent by text message.

**B. Email OTP:** A one-time code sent to the user’s email inbox.

## Comparison table

| Criterion | SMS OTP | Email OTP |
|---|---|---|
| Delivery channel | Phone network | Email |
| Main interception route | SIM swap or port-out | Compromise of the email account |
| Phishing-resistant | No | No |
| Exposed to OTP bots | Yes | Yes |
| Regulator treatment | Phased out in the UAE; barred for high-risk transactions in the Philippines | Phased out and barred alongside SMS in both |
| NIST SP 800-63B-4 | Restricted authenticator | [Editorial: confirm email’s status against 63B-4] |

Cleartext comparison. Regulator treatment from reporting on the UAE[^1] and Philippine[^2] rules.

## Verdict

Don’t replace SMS codes with email codes and call it a migration. Both leave the user holding a code that can be phished or handed over. Move high-risk flows to passkeys or in-app approval on a registered device.

- **Choose SMS OTP when:** Low-risk confirmations only, as a restricted fallback under NIST conditions.
- **Choose Email OTP when:** Low-risk confirmations such as verifying an email address at signup.

## Sources

[^1]: UAE banks cancel OTPs, switching to in-app verification. The Paypers. https://thepaypers.com/fraud-and-fincrime/news/uae-banks-cancel-otps-switching-to-in-app-verification (secondary)
[^2]: No more SMS, email OTPs for high-risk financial transactions starting June 25. GMA News. https://www.gmanetwork.com/news/money/economy/992561/no-more-sms-email-otps-for-high-risk-financial-transactions-starting-june-25/story/ (secondary)
[^3]: SP 800-63B-4: Authentication and Authenticator Management. NIST. https://pages.nist.gov/800-63-4/sp800-63b.html

## Related questions

- [Is email OTP safer than SMS OTP?](https://glide-cleartext.pages.dev/q/is-email-otp-safer-than-sms/)
- [Did the UAE ban SMS OTP for banking?](https://glide-cleartext.pages.dev/q/did-the-uae-ban-sms-otp-for-banking/)
- [What is BSP Circular 1213?](https://glide-cleartext.pages.dev/q/what-is-bsp-circular-1213/)

## Cite

Cleartext. “SMS OTP vs email OTP” Last verified 2026-09-24 (rev. 1). https://glide-cleartext.pages.dev/compare/sms-otp-vs-email-otp/

## Changelog

- 2026-09-24: First published.