Apple’s iPhone has been named the most popular smartphone with mobile workers by iPass.

According to the firm’s latest Mobile Workforce Report, which is released four times a year, 45 percent of mobile workers have use Apple’s smartphone, overtaking BlackBerry.

RIM’s BlackBerry handsets are used by 32 percent of mobile workers, a three percent decrease on last year, while 21 percent of mobile workers have smartphones running Google’s Android operating system.

“While increasing iPhone usage in the workplace was inevitable, this is the tipping point when the iPhone has overcome the Blackberry on its traditional enterprise turf, and business smartphones are in the hands of nearly every knowledge worker,” said Evan Kaplan, president and CEO of iPass.

Furthermore, the report revealed 95 percent of mobile employees have smartphones, up from 85 percent in 2010, with 91 percent of those using the device for work purposes, up on 65 percent last year.

iPass said the adoption of ‘bring your own device (BYOD)’ policies in the workplace meant the number of mobile employees using their own handset in the workplace has risen from 34 percent in 2010 to 42 percent.

A third of mobile employees said they get less sleep because of work, with a quarter saying they get less than six hours a night. Nearly six in ten (59 percent) admitted they’d feel disoriented, distraught or lonely if they were without their smartphone for even a week.

 “Today’s mobile employees are critical to the success of every enterprise, contributing 240 more work hours a year than their non-mobile counterparts. Connectivity is essential because work is no longer where you go but what you do.”

The Mobile Workforce Report also revealed 44 percent of mobile workers own tablet PCs, up on the second quarter on this year when the figure was a third.