Yes, just review the posts above. I contacted Shawn on the IMEI number to provide to ATT for the SIM card. Unfortunaly, I apparently put the SIM card in wrong and also lost the SD card in a small area next to the data card slot and in fell inside the unit. I sent it back for repair and I won't receive back until Monday 12/03. I haven't had much time to use the controller (< week) when this happened. It has a pretty steep learning curve, but I'm a little familiar with JField because we also have the LS RTK system, Just read the manual and take it slow to learn the software. It's pretty amazing to have such sophisticated scientific software and equipment to use. Javad has always been on the cutting edge of GPS technology. The land surveying profession is very fortunate to have him producing such quality equipment and software. If you get stuck with something, use this forum and call one of the support team members, they will help whenever they can.