I worked in the industry for 5 years on the business side, but have kept up with the technology
Verizon Wireless:
I would definitely consider the Razr HD Maxx HD.
-By far the best phone when it comes to battery life
-Motorola was acquired by Google, so you can expect quicker updates to Android software
-I had the Razr Maxx (non HD) for a year and used it heavy for business and could always get 2 solid days off a charge.
If you can wait about another month, Motorola is coming out with the Droid X, which is supposed to be a super durable with even a larger battery than the Maxx HD.
AT&T/T-Mobile/Sprint: (SAMSUNG GALAXY 3)
-Samsung Galaxy 3 decent battery life (Battery reports on the Galaxy 4 seem mixed, so I would wait and read some reviews)
-Samsung is a full featured software phone
-Excellent in receiving Android software updates
-Removable battery so you can buy an extra if you are a heavy user.
-If the Galaxy 3 is too big, they are coming out with a Galaxy mini that might fit the bill
-Since it's the most popular phone, its fairly easy to find accessories for it (i.e. extra batteries)
Tips:
-Go to each carrier's website and check their network in your area, this could have the most impact on your provider of choice.
AT&T Coverage Viewer
Custom JSP Tag Page
Coverage Locator
U.S. Cellular Coverage Indicator | Cell Phone Coverage | U.S. Cellular
-In my experience as far as data networks I have had the best success with Verizon, then AT&T, followed by Sprint and T-Mobile
-If you go with Sprint,
make sure the phone you buy supports 4G LTE. Older model Sprint Phones used 4G Technology called WiMAX, which is all but dead. Sprint has gotten with the times and upgraded to 4G LTE.
I have the HTC One M7(newest model) Great looking and performing phone, but its battery is not user replaceable. That and when you are using it with a heavy workload it does tend to get very hot. I don't think that it would be the best choice for your needs, though I love it for my job!
T-Mobile by far has the best pricing plan @ $70 Unlimited Voice/Text/Data. I have noticed that its voice is great (HD Voice), but its data network can vary greatly by location. That is why its so important to check data coverage in your area.
Great sites to check for phone reviews;
PhoneDog | The Leader in Mobile Phone News and Reviews | PhoneDog
Product reviews and prices, software downloads, and tech news - CNET
Phone Scoop
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On Prepaid Carriers:
- I do not have experience with them, but a lot of people swear by them because of price.
- Other companies to consider may be in your area you might want to check out (i.e. cricket/ Metro PCS / etc)
On buying unlocked phones:
- Pretty much all unlocked phones are GSM
- T-Mobile uses the 1700 band for HSPA+ (3G+) and LTE most unlocked phone will not work for them in most markets though they are moving to 1900
- Unlocked phones are next to impossible to find and work on Sprint/Verizon because their CDMA networks are closed and would take an act of congress