If you get the Verizon Omnia then yes! It is mandatory that you purchase the data plan with the omnia. If you purchase an unlocked Omnia then you might be able to get away with not having to purchase the data plan. Personally after getting the data plan I dont know what I would have done with out the data plan. The data plan opens up a full list of functions that you would not have if it was only a wifi connecting phone. Get the data plan. I have it and love my omnia for it.
I am thinking of getting the Samsung Omnia for verizon, and was wondering if it is required that I have to also get a data plan?