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Phone Category
LeadConnector Phone
29
Why are my Calls marked as Spam and how can I avoid it
Phone Number Settings Explained
How to Purchase a Phone Number for Your Business
Forbidden message categories for SMS and MMS in the US and Canada
A2P 10DLC Campaign Approval Best Practices
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Error Code and Warning Dictionary
21
21211: Invalid 'To' Phone Number
21408: Your account is not allowed to send SMS to this country or region.
21614: 'To' number is not a valid mobile number
21635: The "To" number is a landline and cannot receive SMS.
21661: 'From' number is not SMS-capable
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