If i buy a used iphone from someone do i still have to get a data plan?

My phone from verizon broke and the contract isn't up yet… So if i buy an iphone from someone can it just go onto my regular contract? Or do i need to buy a data plan too?

Added (1). WOW GIVE ME REAL ANSWERS NOT ADVERTISING ;-;

Yes you need a data plan too. It sucks these phone companies getcha every way they can. But if ou do not buy a data plan they will be able to detect what phone you are ow using and automatically set u up for a data plan, and probably the most expensive one at that. It sucks I know.

I know right? That advertising is annoying!

Https://www.cellularcountry.com/ Offers cheap and have a wide variety of refurbished cell phones with a discounted price up to 70%.

When i bought a iphone i had a 16Gb with att found out i need more space bought a att 32Gb off of ebay put my sim card in didn't miss a beat same service same contract att ask no questions just buy same network iphone if you got Verizon buy a Verizon iphone to replace