how long do you have to return a new verizon phone?

i just got a blackberry about 2 weeks ago, and I love it but I really don't need it and I don't have the extra $350 a year it takes to keep it on. How long do you have to return a new phone at verizon after you get it? And do you ahve to get another phone or can you just get your money back? thankssss
do you need the reciept?

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