H iPad Air has a cell-phone number with it. Can I use it's my phone?

I have an iPad Air that I love. I noticed that it has a cell phone number associated with it, and several apps available to use the device as a cell-phone. I don't use the phone on a frequent basis. Is this "legal", and are there any down-sides (cost vs. std. c-phone, et. al.)? Please advise... thanks.

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