- First of all, a tablet-sized device is not practical for phone calls, texting, or Skype, for various reasons. It's really not very safe to cradle a tablet computer to your ear when driving, for example.
- A tablet device is or smartphone are not ideal for word processing, as a touch-screen keyboard may be usable for some light typing, but not real word processing.
- Many devices do not have USB or memory stick ports...the memory is built-in.
1,3, 6, and 7 can be done on iPhone or any smartphone. Most small displays are very hi-res, so it's very usable for e-books, unless you have the eyes of 90 year old, then you need a big e-book reader.
To do word processing or skype video, you need a laptop, which can also do other things on your list, obviously.
A tablet like an iPad gives you 4, 5 (maybe), 6, and 7
Amazon makes some very good (and cheap) e-book readers.