The final step in
the process is to forward the message to our application via an HTTP request. The
critical part in this process is the number that people can send messages to. We need
to buy such a number from the SMS gateway and pay a monthly fee to keep it alive.
Such a number will normally be the full 12 to 16 digit mobile number. Some services
can also use a "tagged number". A tagged number is an actual mobile number with
some additional digits added at the end. All messages sent to the actual mobile
number, irrespective of the tagged digits, will come to that number. The gateway
can then route the message to the appropriate account based on the tagged numbers
we have purchased.
But Luigi thinks this number is too long! And he wants to get a Short Code!
Getting a Short Code
A short code is like a domain name??”an easy-to-remember number that will be used
to access applications online. Luigi, like many others, wants to map the short code to
POTR??”and wants to buy 7687 as his short code. A short code is constant across all
network operators in the region (typically a continent). So all mobile users can send a
message to the same short code and we will be able to receive them.
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