SMS Text Sign Up

Wanted to know if there is a way for customers to sign on by texting me a code or do I have to enter all the numbers in automatically?

With Voicent IVR Studio, you can create custom inbound SMS applications. With an inbound SMS application you could have people text your phone number and automatically store their number to a file or a database. Not only can you store their phone number, but you can do essentially anything you need. You could have it send them information back based on certain things. More specifically if you wanted the people who sent you a text message that said “Sign Up” to be signed up, you could easily check for “Sign Up” in your text messages then do whatever you want with that phone number.