Very few new phones seem to have external antenna jacks. Does anyone know anything (good or bad) about the various non-wired antennas, repeaters, etc.? I travel out where cell phone signals are very weak, and my old phone has a jack for an external antenna that worked quite well. I'd really like to get a newer phone (LG Env3 to be specific) which has no external antenna jack. Would appreciate suggestions for a working solution.