If you see the “Error: No Valid Phone Numbers Found!” message while using SMSGatewayCenter—whether through the API or user interface—it means the system couldn’t process your request due to restrictions on phone numbers. Don’t worry, this is a common issue with simple fixes! Here are the two most likely causes and how to resolve them:
1. Sandbox Mode Restriction #
- What’s Happening: Your account might be in Sandbox Mode, a testing environment that limits SMS delivery to only registered or whitelisted phone numbers. This is a safety feature to help you test without affecting live users.
How to Fix It:
- Check if your account is in Sandbox Mode (visible in your account settings).
- Ensure the phone numbers you’re sending to are added to your sandbox whitelist.
- To send SMS to any number, contact our support team to disable Sandbox Mode and switch to live mode.
- Best For: New users or those testing campaigns before going live.
2. International Country Restrictions #
- What’s Happening: If you’re an international client trying to send SMS to a country not assigned to your account, you’ll encounter this error. Our system uses MCC (Mobile Country Code) and MNC (Mobile Network Code) to define allowed regions.
How to Fix It:
- Verify the country codes of the numbers you’re targeting.
- Reach out to our support team to add the required MCC/MNC codes to your account.
- Once updated, you’ll be able to send SMS to those countries without issues.
- Best For: Global businesses expanding their SMS reach.
Quick Troubleshooting Tips: #
- Double-check the phone numbers for correct formatting (e.g., include country code like +91 for India).
- Review your account settings or API logs for more clues.
Stuck with this error? Our team is here to help! Contact us to whitelist numbers, update country permissions, or switch out of Sandbox Mode. Get back to sending SMS smoothly with SMSGatewayCenter today!