Why can't I activate my iPhone 4?

I need help, I bought an iPhone 4 today 8 gb sprint CDMA, it's clean and NOT stolen or reported lost but I'm having difficulty activating it, when I put in the MEID to activate it on the sprint site or boost mobile site it says " invalid " or " account cancelled or not active " so then what do I do? I can't even proceed with activating it bc it says invalid number yet it's clean I checked on esn checker.com I need help please What do I do

Go to apple. They will do it for free. Or try the HEX or the other numbers.

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