I have Samsung G2 (? think it is that one) phone and an iPad mini. Neither of those devices would fit your specific current requirements, but in terms of sizing (pocket-ish sized phone & small tablet) I would say they absolutely hit the spot. The iPad mini is great for reading books/documents (even PDFs), webbrowsing, etc; the phone is great for being pocket-sized and being able to read things if pushed.
I believe the Nexus 7 is the same size, give or take, as the iPad mini. If I were replacing a tablet and switching OS that is certainly what I'd go for. I actively wouldn't want a larger tablet. I might go for a slightly smaller phone (but definitely not larger).
My experience is that I only very rarely need to do the setting-up-WiFi-sharing thing with phone+iPad; almost all of the time I can get by with the phone if using 3G, or use the iPad offline.
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I believe the Nexus 7 is the same size, give or take, as the iPad mini. If I were replacing a tablet and switching OS that is certainly what I'd go for. I actively wouldn't want a larger tablet. I might go for a slightly smaller phone (but definitely not larger).
My experience is that I only very rarely need to do the setting-up-WiFi-sharing thing with phone+iPad; almost all of the time I can get by with the phone if using 3G, or use the iPad offline.