So far, Mobile, Broadband Revenues Compensate for U.K. Fixed Voice Losses

In 2008, 49.6 percent of U.K. retail revenues were earned providing mobile and data services, while 33.8 percent of revenues were earned from fixed and mobile data services, says Ofcom, the U.K. communications regulator.

The long term challenge is that even a majority of current mobile voice revenues are likely to shrink as mobile VoIP services become more widespread.

That doesn't necessarily mean voice usage has been falling. Instead, we essentially have productivity effects, as the per-unit cost of using voice has fallen as volumes have grown. That doesn't necessarily mean voice revenues will disappear, but that voice will be a smaller percentage of total revenues on both the fixed and wireless networks.

And though mobility has been the revenue source primarily responsible for telecom providers managing the transition away from classic fixed voice, that will not always be the case. Mobile voice revenue growth has slowed significantly as penetration has saturated and prices have fallen.

Mobile voice revenue growth was just 1.6 percent in 2008, compared to an average of 7.7 percent annual growth over the previous five years, Ofcom says.

As voice services generate nearly three quarters of total mobile revenue, there was a similar

slowing in the growth of total mobile service revenues, to 2.2 percent in 2008, compared to the

annual average of 9.6 percent growth over the previous five years and 15.5 percent over the previous ten years.

Fixed voice revenues have been in decline since 2000 when they reached £12.3 billion, and had

fallen by 26.9 percent in nominal terms from this peak to £9.0 billion by 2008. Growth in mobile voice revenues, which more than tripled from £3.6 billion to £11.5 billion between 1998 and 2008, ensured continued growth in total voice telephony revenues until 2008, when they declined for the first time.

All of that is important for one salient reason. Some have argued that telecom providers would collapse as their core businesses were undermined by new IP-based alternatives. And while the danger remains, so far service providers have proven adept at creating new replacement services and applications at nearly the pace the legacy revenues are falling.

The possibility of disruption exists, of course. But at least so far, telecom providers have proven themselves rather more adept at structural change than many had expected. IP is disruptive to many industries. Whether it is fatal remains to be seen.