Common causes
Invalid or incomplete phone number
Missing country code
Lead opted out
Carrier blocking
Fix
Use full phone number with country code
Remove unnecessary symbols
Try sending a short, simple test message
Causes
Carrier filtering
Unsupported characters
Number unreachable
Avoid links in the first message
Keep messages short and natural
Confirm the number is active
Verify phone number
Refresh inbox
Check if lead responded from a different number
Last updated 1 month ago