Just activated LG Optimus Elite - Can't send or receive text messages

[DarrenS17]

Hi friends. I had a Samsung Conquer which had an untimely run-in with a parking lot pavement thus cracking the screen. I have Sprint and my upgrade policy thing allowed me to get a LG Optimus Elite. The activation took place fine, my contacts/pictures transferred over and I can send/receive phone calls normally. However, I'm not able to send or receive texts; whenever I attempt to send a message, it says the message was not able to be sent. I tried going to Menu->Settings->Update profile, but that didn't help. Any help?