What makes a phone number "valid" or "invalid" for receiving SMS messages?

Example: Which of these are valid numbers? (320) 241-4946 +1 (320) 241-4946 +13202414946 13202414946 3202414946

If the phone number is active and is a number that can receive SMS, it is valid. Because all the above are valid phone number formats, each is valid.

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