The alphanumeric sender ID technology allows the sender to send messages using a custom, recognizable sender ID constructed from any combination of numeric and alpha characters (0-9, a-z, A-Z, _).
Therefore, an alphanumeric sender ID is much more recognizable by users so they can identify the sender more easily. This way, the sender ID can be used to present anything from a company name to a name of any government organization. However, the receiver of the message can`t reply to a message sent with an alphanumeric sender ID.