Can you transfer a verizon plan from a normal cell phone to a palm treo or Q w/o additional costs?

Say I have a normal cell buzz plot, and I can get a Palm Treo or Motorola Q from a friend or ebay or something, if I go to conveying my number to that smartphone are there extra costs.. or can I do it no matter what even if some applications or uses are rendered useless? Thank you!

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