Your account must be provisioned for text messaging before you can receive 1 way text messaging or 2 way SMS notifications. You don't necassarily need to subscribe to wireless web or Vision, but you must login to the SPCS manage portion of the website, click on text messaging, and follow the prompts to setup a username and password. My friend has not done this and I can send him messages till I'm blue in the face (1 way or 2 way) and he will never receive a notification. Another friend of mine does not pay for Vision but has a vision handset. He didn't receive notifications either until I walked him through the process I mentioned above.