I have just purchased two LG phones. Model FX0. I want to upgrade the OS to utilize the 4G frequencies. The specifications list that 4G is in the hardware. I am using the pre-release 2.0 OS. Can I update the OS to 2.5? I also need a good GPS App or website for navigation. My first Firefox Smartphone, had a developer in Israel who offered to sell an app that worked perfectly. I no longer wee that vendor listed in the Firefox Market Place. This is my fourth Friefox Smartphone. I want to remain a Firefox Smartphone user. Here in the United States, my local AT&T is supporting my phone. Any assistance is highly appreciated, as we are a Firefox OS Family. We try to use only open source alternatives. Not necessarily free, just open source. Our PC's operate on Linux as well. Respectfully, Jack H.