It will be a lightweight small device.
My view is that there is no need for high-definitin big screen, as the phone users are not concerned with watching high-definition video and images.
The screen would be mid-sized that allows good visibility of an on-screen keyboard and permits easy typing, whether with finger or with an attached or built-in telescopic pen.
in addition to the basic functions of a cell phone, as calls, messages, email, calendar, ..etc., it would also perform postioning & simple navigation.
The Business-related features of the device are:
Market & Stocks monitoring, limited -but satisfactory- business social communication, payment processes, it would have a simplified text viewer (whether text, Word, or PDF), and also support for displaying simple graphs, tables, charts ..etc.
It would also, be equipped with a simplified browser, with specified features for business-related puposes.
Simlpe browser can easily be made safer as well.
Two versions of this devjce might devlop:
The 1st would be equipped with ordinary recent coloured screen, but without very high - unneeded - resolution.
The second version would come with relective monochrome screen (as those of Garmin smart watches) which might be equipped with a small internal lamp (activated manually) for lightening the screen in dark or dim conditions.
The advantages of this 2nd version are two:
1 - prolonged battery life and eliminating the need for frequent charging, (suitable for all-the-day outdoor workers) for instace.
2 - Abitity to view the sreen clearly even in strong direct sunlight, by virue of its reflective technology.
The target customers of this device are:
Businessmen, Executives, Secretaries, Stocks brokers & dealers, Sales managers & representatives ..etc.
It could be a promising product.