Replying to an SMS sent from a modem of SMS service? -


I am trying to implement my theoretical SMS web service (to understand how it works, I have posted some other related questions, I think this is).

  1. Set up a PC. It requests a website which I do to send SMS messages: The destination phone number entered by the user and the text message entered by the user
  2. I get the GSM modem or just GSM phone I connect it to the computer I do
  3. I get a service plan from Verizon or whatever, some unlimited SMS messaging plans.
  4. They gave me a SIM card, in which my unique phone # connected to it (ex: 555-5555) I stop it in GSM modem.
  5. I get some applications (like Kanal) which interfaces with the modem and sends messages from my machine.
  6. Now user enter my theoretical website, a phone # and message I capture that data, it moves forward. Canal interacted with the modem, passing the data for this message. Modem communicates with the carrier network signing up with me, and transmits the actual SMS about it. Carrier Network routing messages to the actual destination.

I understand how this works, now the recipient of this text message will pop up this message with its modem number (555-5555) on their device. In fact, all the thousands of people who use my service will see the same basic phone number.

If so, how are these third party SMS applications unique to answering messages sent to people? ?

For example, when I sign up on an iPhone for one of these 'free' SMS services, then give me a unique user ID like '123'. My friend is on a general AT & T phone plan, he can send an SMS addressed to '123', and I will get a message in some way. How do AT & T know about this third party service route? I can not imagine that they will get a new SIM card in some way, a unique phone number per user who will sign up for their service!

Thanks for all your help

thanks

In order to actually use cell network carriers (such as AT & T, Verizon), rent a custom phone number (called "short code") for three parties.

You can not usually get these short codes directly from the carrier, but you can go through a third party company for rent to use the short code carrier short code And have worked with companies like Open Market. These companies are sometimes known as "SMS / MMS messaging aggregators" because they combine messaging services in many carriers May include and provide them to you like people / companies. The aggregator will expose the API (SOAP / XML or Binary Protocol) for some time to access the messaging service to send and receive messages.

There are other ways to do this, it is just my experience.


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