The research from M:Metrics' MeterDirect Syndicated Measurement Service is based on 'in-tab' panel sizes of approximately 500 people in the US and 600 in the UK during April.

Google came out on top in both countries, having been visited by 62.5 per cent of smartphone users in the US and 31 per cent in the UK.

M:Metrics says that on average more than one-third of smartphone browsers are using the web almost every day. 

The data below doesn't refer to specific URLs or services - instead each name in the top 10 listings refers to an aggregate of company-owned domains.

US: Top 10 mobile web companies visited by smartphone users (% active reach, April 2007)

Google, Inc - 62.48%
Yahoo, Inc - 33.54%
Microsoft Corporation - 33.36%
AT&T, Inc - 21.22%
Time Warner, Inc - 19.06%
The Walt Disney Company - 17.00%
News Corporation - 15.54%
Sprint Nextel - 15.29%
The Weather Channel Interactive, Inc - 15.28%
eBay, Inc - 14.19%

UK: Top 10 mobile web companies visited by smartphone users (% active reach, April 2007)

Google, Inc - 30.94%
Orange Personal Communications Services Limited - 21.68%
British Broadcasting Corporation (BBC) - 20.90%
Microsoft Corporation - 17.75%
Vodafone Group - 16.79%
eBay, Inc - 13.08%
O2 (UK) Ltd, Service Operations - 12.77%
Hutchison Whampoa Limited - 12.67%
Yahoo, Inc - 10.97%
Deutsche Telekom AG - 10.71%