I just talked with Trackimo Tech Support regarding identifying of the 2 vs 3g unit. The 2G unit has a 6 digit serial number starting with the number 1. The 3G unit has a 9 digit number starting with 3. I just went through this with Drone World. I specifically stated I wanted a 3G.... they sent me a 2G I had activation issues with. After talking with Trackimo, they confirmed I was sold a 2G. I bought a new 3G direct from Trackimo and sent the Drone World Trackimo unit back for refund