[iPad Mini] Can an iPad Mini + generous data plan replace an iPhone?

I find that I use my iPad more and more recently. Lets just hypothetically speaking that an iPad mini has a retina screen (inevitable). Would you be able to replace a phone with an iPad mini with say, unlimited data (which I have), or even a 5gb plan?

What would you use in conjunction with iMessage? I have never explored google voice but I'm assuming that's an option. What about calling? I don't talk on the phone much but that's definitely an option.

I can see with the right device the tablet will someday merge with the phone, what do you guys think it will take for this to happen?

Source: http://forums.macrumors.com/showthread.php?t=1483731&goto=newpost

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