The move to appoint a "big four" accountancy firm comes as Unicom continues its relentless growth having just posted 2007/2008 financial year sales of £41.6 million.
Unicom saw a 13.5% increase in sales and a 23.6% rise in profits to the end of April 2008, its ninth trading year.
The Manchester-based business saw turnover increase from £36.7 million to £41.6 million, with pre-tax profits at £9.5 million compared to £7.7 million to the end of April 2007.
"2007/08 has been another excellent year of trading and forecasts for 2008/09 are equally positive - we're expecting turnover to reach £45 million and profits are projected to rise to more than £11 million," said Chris Earle, Operations Director of Unicom.
"Furthermore, we saw our highest ever monthly sales in May 2008, which is also a strong indication that despite difficult economic environment, we are clearly providing a highly-competitive and highly-rated service which seems to be pressing all the right buttons with a very price-sensitive small business customer base.
"Our customer retention level is currently running at 86% against a sector average of around 70%. Of the 14% we lose, only a third go to competitors, the remainder being businesses that close or move premises for one reason or another, which is obviously beyond our control.
"By appointing PwC as our auditors, we are also sending clear signals that it is our intention to operate to high standards, and to provide the highest-quality products, service and support."