Mobile radio dead zones leave remote workers cut off from their group. Work slows. Safety is in question. Iridium Push-to-Talk doesn't have dead zones. Handheld phones for workers on foot and docking stations for workers in buildings or vehicles assure instantaneous group-wide communications and location awareness. For a comparison of different Iridium PTT equipment, click here. Outfitter Satellite is an Authorized Iridium PTT Reseller.