When you find a romset that works properly for you, you will likely want to share it with other libretro cores, so that they may use it too. As of r88, there is a set of shared libretro cores called RetroArch, available for Ubuntu, OSX and Windows.
RetroArch allows you to use the same core with multiple builds, because it will setup the software interface to allow cross-platform operation on any device, including for the individual cores, as well as the applications using it. It will not work properly for this guide, but is included to give you an idea of how other cores work.
After you have found a suitable romset for your device, you want to put it in your device. Familiarize yourself with the romset page on our wiki. You will have to figure out if the romset is compatible with the hardware your device uses and if it does, how to put the romset files into the device.
Is there any imporant factor, besides the physical build up of the wireless network, that can force a wireless phone to not support a 4G network? We have a data card that supports 4G, but we can't use it cause our phones don't support 4G.. d2c66b5586