Does watching videos take up data or money on my iphone 4s?

I have a 16 gb iphone 4s from verizon and i always download videos on my computer then transfer it onto itunes then put it into my phone. But if i watch those videos, does my data or bill go up?

No. Only if your watching videos online like youtube. You only use your data when you are using the internet for anything and you don't have any Wi-Fi

Yes.

Nothing would happen. Those videos play from the iPhone's hard drive not streamed/downloaded from the internet. No charges.

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