what is the most cost efficent cell phone carrier

I’m currently on Verizon but my plan costs $110 a month. I need something cheaper, so I want to switch to another cell phone provider but still keep my same number, pay a low monthly fee for unlimited text, calling, and data. I also want to get it with an iPhone 5.

I currently have an iPhone 4s, can I cancel my contract with Verizon and sell my iPhone 4s and buy the iPhone 5s from Verizon but still keep my same number?

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