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Why Can’t SMS Recipients Respond to Messages Sent Using an Alphanumeric Sender ID?



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Why can’t SMS recipients respond to messages sent using an alphanumeric sender ID?

For a phone to send a response to a message, it needs a mobile number to respond to. When you send out messages with an alphanumeric sender ID, the receiving phone does not have a mobile number to reply to, and therefore it cannot establish two-way SMS based on an alphanumeric senderID.