I just bought the Wilson model, needed it for work. Mine doesn't need to be in a holster or nothin, just within a couple feet of the phone. Its no miracle worker either but it has helped a bunch. Radio Shack will try to sell it to you for $300 or so, but if you search the net it can be had for $170, wish I could remember the site. Easy to install yourself. I'm working in the oil fields out in BFE and thats the one everybody told me to get. Its a Dual Band Amplifier and its made by Wilson Electronics, no model # on it, but I suggest getting the one that doesn't require you to put your phone in a holster.