Verizon:

 The biggest wireless carrier in United States, Verizon Wireless operates a robust and far-reaching 4G LTE network and a strong lineup of smartphones, feature phones, and basic handsets. A joint venture between Verizon Communications and Vodafone, Verizon Wireless was formed in 2000 through a merger between GTE Wireless and Bell Atlantic.

About Verizon Wireless:

• Verizon requires a "Share Everything" plan that includes unlimited and text and voice calls for multiple devices plus a monthly allotment of data use. The monthly price increases based on the number and type of devices you add to the plan and the amount of data that you elect to use.
  
• As a CDMA carrier, Verizon's international coverage is limited to a handful of countries, but it offers dual-mode CDMA/GSM handsets.
  
• Verizon offers prepaid plans. 

AT&T:

AT&T is the second-largest wireless carrier in the United States after Verizon Wireless, at least for now. Today, AT&T has an extensive lineup of GSM devices, and it continues to grow its 4G LTE network. The current company came to be in 2007 when Cingular Wireless, which acquired the original AT&T Wireless in 2004, changed its name to AT&T.

About AT&T:

• Like Verizon, AT&T has shared plans with data tiers for smartphones customers, but customers can stick with an individual plan if they prefer.
  
• As a GSM carrier, AT&T offers extensive international roaming.
• AT&T offers prepaid and family plans.

 T-Mobile:

 After narrowly escaping a merger with AT&T in 2012, T-Mobile remains the smallest of the big four U.S. carriers. It now operates an LTE network and continues to operate an HSPA+ "Faux G" network that offers LTE-comparable speeds. T-Mobile was the last major carrier to sell the iPhone and it was an early leader in Android. Compared with the other major carriers, its home network is less prevalent in rural areas.

About T-Mobile:

• In March 2013, T-Mobile changed its service plan model. Most importantly, it did away with contracts completely, which means that you can end your service at any time. Customers get unlimited voice and text messaging service, and on top of that can choose from a variety of data packages. Though total data use is unlimited, T-Mobile prices its plans by how much 4G data you can use each month. Also, T-Mobile no longer offer subsidies for its phones. You can either pay full price for the phone up front or you can "finance" your handset by paying monthly installments for two years.
  
• As a GSM carrier and a subsidiary of Germany's Deutsche Telekom, T-Mobile has extensive international roaming.
• T-Mobile carrier offers family plans.

Sprint:

 Though its merger with Nextel occurred way back in 2005, Sprint finally is phasing out the defunct carrier's iDEN network while retaining push-to-talk service. Sprint was the first carrier to offer a 4G network through WiMax technology, but it is now transitioning to LTE. As such, its 4G coverage is far behind that of AT&T and Verizon for the time being. Sprint carrier offers handsets of all stripes, including a few handsets with rugged designs.

About Sprint:

• Sprint continues to offer unlimited calling and data plans.
• Its international CDMA coverage has a smaller footprint than GSM, but Sprint has dual-mode CDMA/GSM handsets.
• Sprint has family and prepaid plans. Prepaid service also is available through its Boost Mobile and Virgin Mobile subsidiaries.

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