I love my iPad Nano 3G - it is small, has great battery life, and it can do just about everything my iPad 3G does...
In case you're confused... It is an iPhone 3GS! Still a great device after some years of use!
As they say, the best camera is the one you have with you - that's true for my iPhone camera, but the same can be said for computers! The best computer is the one you have with you! And, I always have my iPhone with me.
In fact, this post was written on the squarespace app on my iPhone. I love it!
What phone do you use? And what do you use it for?