I want to use a server as a device to run a script to parse a SMS text in the following way.

I. The person types in a specific and special cell phone number (Similar to Facebook’s 32556 number used to post on your wall)

II. The user types a text message.

III. The user sends the text message.

IV. The message is sent to some kind of Device (the server) or SMS Gateway and receives it.

V. The thing described above that the message is sent to then parse the test message.

I understand that these three question will mix Programming and Server Stuff and could reside here or at DBA.SE

1. How would I make such a cell phone number (described in step I) that would be sent to the Device?
2. How do I create the device that then would receive it?
3. Finally, how do I Parse the text message?

I don't want to pay for cloud space, server scripting stuff or server space; I want to just use a free webserver to do this totally free - meaning I will have to do more on my own...

My question can be seen in more depth in this visual flowchart