Canada’s wireless carriers are telling the investment community that the share of overall average revenue per user from wireless data services is growing because of increases in text messaging and other data services. While Microcell Telecommunications Inc. says that its wireless data revenue as a part of ARPU has grown to about 3% to 4%, Rogers Wireless Inc. notes in its Q3 conference call that 5.7% of ARPU is from wireless data services.  Nadir Mohamed, president and CEO of Rogers Wireless, even stated that previous estimates of 10% data ARPU in 2006 are conservative and that level could be higher.  While the wireless operators are bullish on the coming impact of data on their ARPU levels, voice will remain the dominant contributor to ARPU for the foreseeable future. According to Mark Quigley, research director of the Yankee Group’s Canadian Market Strategies, increasing data portion of ARPU will be difficult because Canadians appear unwilling to pay for data services.  "I think there’s an expectation in the Canadian market place that you simply shouldn’t have to pay for those services for some particular reason, and I think that translates into an understanding of what the value proposition for consumers is. I would suspect that if we took a look at ringtones, there is probably a tolerance to pay for those services. But I would suggest that the dollar figure for them is going to be quite low.  "We have seen some fairly significant success on the SMS side and we anticipate that that’s going to continue, but I still think it points to a fundamental challenge that the carriers are going to have in demonstrating what the value proposition for the data-based services is going to be," Quigley said during the State of the Canadian Wireless Dominion audio conference late last month.