There are plenty of areas of the country where cell phones still do not work, even with amplifiers. You may not be able to do anything about this except buy a expensive satellite phone. plenty of other areas have marginal coverage. There may be a signal in the air but your phone is barely able to pick it up due to a number of reasons.
Modern cellular phones have a low power output, about a third of three watt or less, and a puny little antenna that actually reduces that three third of a watt to even less.
With a properly sized external antenna (outside on your vehicle or home's roof) you can boost the signal from your phone several DB or decibels, which equates to several times your phones output power.
In addition you can add to that antenna an amplifier that boosts your phones puny wattage up to the maximum wattage allowed by the FCC, three full watts.
In the past plenty of cell phones were made with a small antenna jack, on the back or side of the phone, under a rubber plug, that you could connect to a rooftop magnetic mount antenna.
The problem nowadays is that plenty of new high tech phones do not have these external antenna ports.
These are notoriously "lossy" and do not conduct much of the signal in to the outside antenna.
The other alternative is to use a wireless repeater type of mobile phone amplifier such as those made by the industry leaders, Digital Antenna and Wilson.
In that case your options are using a stick on "passive" adapter which conducts the signal from your cell phone's internal antenna in to the wire leading to the external antenna.
While these devices won't perform miracles, such as allowing you to make a phone call in the bottom of a canyon far away from any tower, they will permit you to use your phone in marginal rural and urban areas where your phone is not strong on its own.
This type of mobile phone amplifier works like a small mobile phone tower and receives the signal that is transmitted from your phone, amplifies it plenty of times, and sends it out to a high gain antenna that also amplifies it further. It works the same in reverse, amplifying incoming calls plenty of times over so that you will have several bars on your phone where you may only have two.
The other lovely feature of the repeater type amplifiers is that they will permit any mobile phone, or even multiple cell phones and even pc web aircards to be amplified if they are within a few feet of the small antenna inside of your vehicle or home. Most units are 12 volt DC and can be placed on an AC adapter for use in the home. Other models are made only for home use.
i have used three for years as a long haul trucker and have been able to make emergency calls in areas where other cell phones do not work.
You should look for three that is dual band, or three that works on both 800 and 1900 MHZ. This will permit them to work with most phones from Sprint, Verizon, Alltel, At&T, etc. Most do not work with Nextel though.
A Guide To mobile phone Boosters and Amplifiers.
http://www.ehelpfultips.com/how_to_get_better_cell_phone_rec.htm
editorial Source: http://EzineArticles.com/?expert=Sam_Bre
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