HI Jospeh,
on the page 3 of this post you can find my test program for receiving SMS messages live. Change some parameters of the Init subVI according to your modem (baud rate, handshanking,...). Start the program than send SMS message and modem will read the sent message. With this program you cannot read already received SMS messages. For reading these SMS messages you shoud use List command. Go to my site https://sites.google.com/site/tstalevski/listing-sms-messages to download subVI for listing SMS messages.