by 
The Curious Bag
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<h4 class="dechead">On One Hand: Amplifiers Increase Signal Strength
A signal amplifier will tune in to weaker cellular signals that are in your area and focus them into a stronger signal so that your cell phone will be more efficient. The amplifiers work very well inside buildings and in areas of low reception.
On the Other: Compatibility May Be an Issue
Certain cellular amplifiers will only work on certain bandwidths or frequencies of signals. Additionally, certain cellular providers will only operate on certain frequencies. If you're going to get an amplifier, you have to be sure it will work with both your phone, and the local network provider.
Bottom Line
Getting a cell phone signal amplifier is a good idea for improving your reception, but you should be sure to research just what type you need. You should also check on return policies, just in case it won't mesh with your phone, your local area or both.
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