Hello,Just for others information around AT&T service in the US. If you purchase a new sim and use it for the Gemini you will more than likely be only able to see 3G on the device due to AT&T not updating this in there database. The solution that I did was simple take an old iPhone 5 that I had laying around and put its IMEI number in my account on the AT&T webpage. Reboot the Gemini and 4G LTE is available. Easily 4-5X faster with speedcheck. Once the sim is mapped for a registered 4G device, you simple put it in the Gemini and off you are running. Hope this helps others, I was fighting this battle for a while.ThanksIshman