When a verification code never arrives, users abandon signup. In Egypt this is common: delayed SMS, filtered messages, full inboxes, and roaming. This page explains why OTP fails and how missed-call verification avoids waiting for a code.
What “OTP not received” usually means
- The user typed a real mobile number but no SMS appeared.
- The code arrived minutes later, after they already left.
- The message landed in a spam or SIM-toolkit folder.
- The user is on a network that throttles A2P SMS.
Why verification codes fail in Egypt
SMS OTP depends on a chain you do not control: your provider, aggregators, and the mobile operator. Any hop can drop or delay the message. Peak hours make it worse. International routes and virtual numbers fail even more often.
Retrying the same SMS rarely fixes a blocked route. It increases cost and still leaves the user staring at an empty code field.
A path that does not wait for a code
Missed-call verification asks the user to place a short call to a number shown in your app. The call is not answered. When the ring is matched to the session, the phone number is verified. There is no OTP to type and nothing that can sit in a spam folder.
Who this is for
This is for product and engineering teams building signup or onboarding. It is not a consumer tool to recover someone else’s WhatsApp or bank OTP.
When to keep SMS anyway
Keep SMS if you must verify landlines, or if your compliance policy explicitly requires a one-time code. For Egyptian mobile apps, missed-call is usually faster for the user and cheaper at volume.
Next step for developers
Shernova is a phone-verification layer for your app, not an end-user consumer app. Create a developer account, follow the quick start, then test the flow from the dashboard.