They can be great for tablets, but users had difficulty reading open books in a small smartphone. Phablets may be better for the consumption of open books.

What i mean by this is that not only do apps that are designed for connectivity require connectivity but all apps do to some extent as they need to be updated and there are no offline app markets that can be added through LAN. We could store a large number of *.apk in a hard drive but there is not an easy distro with an appstore included yet.