• Valid - Specified phone number is syntax-free and is a reachable number. This could be either a landline or a mobile phone number.
• Invalid - Specified phone number is invalid and any contact should be avoided.
• Unknown - The status of the phone number cannot be detected.
• Mobile phone number - Valid mobile phone numbers that accept SMS.

erxes will send SMS only to phone numbers that are "valid" or "mobile phone number". If you wish to update the status of an individual phone number that the system deemed "unknown", but you know that it is valid, you can verify it manually, similar to the email verification process.