Is an iPhone useless without a data plan that has internet?

I was planning on buying an unlocked iPhone from Craigslist and just inserting my sim card in but i would like to know whether it's worth it or not. I will have access to the internet (through wi-fi) for the iPhone, just not a data plan that includes internet.
i want an iPhone because my current phone is crapping out on me and i need a new music device.

Yeah it's pretty much useless. The iPhone is designed with the internet in mind. When I'm using my iPhone, 90% of the time I'm on the internet. It's very convienent and I couldn't imagine life without my iPhone. I can prove somebody wrong in a matter of seconds. It doesn't get any better than that.

As long as you can be near your Wi-Fi hotspot when you need to use the internet then yes its definitely worth it.

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