Guides
Phone verification without a code
Developer articles on OTP failures, SMS alternatives, Firebase phone auth, and cheaper missed-call verification in Egypt.
OTP problems
OTP not received - why verification codes fail
Why OTP and verification codes fail in Egypt, and how missed-call phone verification avoids waiting for SMS.
OTP alternative
SMS OTP alternative - missed-call verification
Replace SMS OTP with missed-call phone verification for Egypt and MENA apps. Compare user steps, failure modes, and cost.
Firebase OTP
Firebase OTP problems on Egyptian numbers
Firebase Phone Auth SMS issues: undelivered codes, quotas, and SHA setup. How to keep Firebase and change only phone verification.
Phone verification
Easiest phone verification for Egyptian apps
Phone verification for developers: prove mobile ownership with a missed call. Built for Egypt and MENA Flutter and Android apps.
Pricing
Cheapest phone verification: cost per success
Compare SMS OTP retries with missed-call credits. Cheapest phone verification is cost per completed signup, not the sticker SMS rate.
Firebase alternative
Best Firebase Phone Auth alternative for MENA
A Firebase Phone Auth alternative that does not send SMS OTP. Keep the rest of Firebase and verify Egyptian numbers with a missed call.