Can I switch carriers and keep the same #?

Currently i'm on verizon with my dad (parents are divorced) I'm ordering an iPhone 4S on Sprint this week because i've been hounding my dad for a new phone but always says "i'm broke" but i know he isn't so my mom said i could join her sprint plan. My dad doesn't know and my mom said not to tell him. But to make a long story short can i keep my same number?

No; you can only keep your number if you switch phones on same carrier

Back in 2005 or 06 laws were passed to allow portability of numbers---So the answer is YES
http://www.fcc.gov/guides/portability-keeping-your-phone-number-when-changing-service-providers

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