Iphone and ipad are almost the same thing.how do put both of them to different uses?

I have an ipad since a long time.recently, i bought an iphone. Now the problem is, both of them are basically the same, as far as its uses and apps are concerned. I can do whatever i did using my ipad, now with my iphone. Can anybody please suggest me how i can put both these devices to different uses? Or atleast make sure of these are left unused?

Ipad = book reading (ibooks). I don't want to read books on a little phone screen, but the larger ipad screen is even better then a real book.

Use your iPhone when you're out and about, calling people and using apps when you're bored. Take photos and such.

Keep your iPad at home and use it for social networking, watching videos, looking stuff up you don't know, and general web searching.

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