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the amount of dropped calls anyone will receive depends on where you are in the country when making a call. Certain carriers 'own' a specific region, meaning that they have towers in that area. If you have a Verizon mobile and travel into a Cingular region, you may have more dropped calls simply because there will be a chance that the phone will not connect to a tower. All cell phones automatically try to connect to the closest tower owned by it's company, but sometimes they connect to the closest tower even if it does belong to a different carrier. That's is what we call roaming, but most carriers puch national rate plans which do not charge for roaming. Because of all this, you want to find out what carrier works the best in your area, you can do this by talking to sales reps and having them call customer service for you to see if they have a tower in the area. Some reps are rude and may not do this for you, but try around and I'm sure you'll find someone nice enough to do their job.
Hoped I helped!