A couple years ago we decided to get rid of our landline but agreed to get a network extender to be on the safe side since we live on the edge of the coverage area. The network extender worked fine with the wife's Blackberry, my Samsung Alias, and later with my iPhone 4. Last December (2011) my wife upgraded her Blackberry to an iPhone 4S. This phone also works fine with the network extender.
Now for the weird part. A couple weeks after the wife's upgrade, we bought our daughter an iPhone 4S. One year later, this phone has been plagued by dropped calls. The only time she can answer a call and not have it drop is when the network extender is offline or out of range. The only thing I can think of that makes the daughter's phone different from ours is that both the wife's phone and my phone were activated at the Verizon store. The daughter's phone was ordered at the Verizon store and delivered to our home where it was activated via iTunes. Luckily our coverage area is good enough that switching off the network extender only kills service in the basement.
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