Sender id messages

Hello,
any idea why on iphone you can't recive any sms with the sender-id shorter than 3 digit?
Example: if you subscribe to a service named AA, you will never recive any sms from the service AA, but for your operator all messages are delivered.
Thnx

Sorry, maybe I didn't explained well the problem.
By Sender ID, i meant the "name" that you can use in large account sms. This will be displayed like the name from who you have recieved the sms.
http://en.wikipedia.org/wiki/SMS_spoofing here i find more information, but nothing telling the minimum lenght...
The short numbers i agree that they must be at least 3 digit numbers.
Thanks anyway

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