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How to Verify Phone Number Using SMS Code



- Verify Phone Number with SMS Code




Send a single-use, six‑digit numeric code via an SMS gateway and require the user to enter it within five minutes. This approach blocks most automated sign‑up attempts while keeping the flow quick for real users.

How SMS verification works




The process consists of three steps:


Collect the user’s phone number in a standard E.164 format (e.g., +15551234567).
Generate a random 6‑digit code, store it temporarily in a secure cache (TTL = 300 seconds), and dispatch it through a reputable SMS provider.
Validate the submitted code against the cached value; on success, mark the number as verified.


Each step can be logged for audit purposes without exposing the code in logs.

Best practices for implementation




Follow these guidelines to keep the verification reliable and user‑friendly:


Choose a provider with high delivery rates. Compare delivery reports for local carriers; aim for > 95 % success.
Rate‑limit requests to three attempts per hour per phone number to reduce abuse.
Include the app name in the SMS body (e.g., "Your AcmeApp login code: 123456").
Store the code using a cryptographic hash; never keep the plain text longer than necessary.
Provide an alternate verification channel (email or voice call) for users without SMS access.

Testing and monitoring

Deploy a staging environment with a sandbox gateway to verify formatting and latency. In production, monitor:


Delivery time (average 
Failure reasons (invalid numbers, carrier blocks).
Success rate per country (adjust provider contracts if a region falls below 90 %).

Security considerations

Do not reuse codes; regenerate for each request. Implement HTTPS for all API calls and enforce authentication on endpoints that trigger SMS sends.

User experience tips

Show a countdown timer next to the input field so users know how long the code remains valid. Offer a clear "Resend code" button after the timer expires, but keep the rate‑limit in place.

Complete KYC: Upload ID and Proof of Residence

Upload a color mostbet bd scan or high‑resolution photo of your government‑issued ID (passport, driver’s license, or national ID) and a utility bill dated within the last 30 days in the same verification step.


Use JPEG or PNG files no larger than 5 MB; the platform automatically rejects blurry images, so check focus and lighting before submission. Crop out unrelated details, but keep the full document visible.


Match the name on your ID with the name on the utility bill. If the documents show different spellings, correct the discrepancy in the profile notes to avoid manual review delays.


After uploading, the system runs an instant OCR check. If the text is unreadable, you will receive a specific error message; address it by retaking the photo under even lighting.


When the verification succeeds, the KYC status changes to "Verified" within minutes, and you can proceed to the next onboarding stage without contacting support.