Penfon, Inc.

In addition to the telephone function, it is also equipped with a phone book, electronic money, and voice/video recording function.
Your call can also be recorded. Also, the biggest feature that is planned to be implemented in future is that you can draw a picture in an email (copyright registered).
Your email can be instantly turned into a presentation material. It won't be so long before the main device of the time is replaced from smartphones to tablets with Pen phones.