Question

Wireless technology has made communicating more

The forerunner to cell phones, PDAs, and smartphones was

Because wireless technology has had such a profound effect on the business world, people have more freedom to work

Answer 1

Here are natural completions for each fragment, plus a brief expanded version you can use in an essay:

1) Wireless technology has made communicating more efficient, immediate, and accessible from virtually anywhere.

2) The forerunner to cell phones, PDAs, and smartphones was the early mobile radio/telephone systems (including car phones and the first portable “brick” phones), with earlier roots in the telegraph and radio.

3) Because wireless technology has had such a profound effect on the business world, people have more freedom to work remotely, collaborate across time zones, and maintain flexible schedules.

Expanded paragraph (one possible way to join them):
Wireless technology has made communicating more efficient, immediate, and accessible from virtually anywhere. The forerunner to cell phones, PDAs, and smartphones was the early mobile radio and telephone systems—later refined into portable “brick” phones and personal digital organizers—with even earlier foundations in the telegraph and radio. Because wireless technology has had such a profound effect on the business world, people have more freedom to work remotely, collaborate across time zones, and adopt more flexible work schedules.