There'll be 29 million smartphone users making video calls by 2015, according to a report from Juniper Research. However, that still leaves at least 90% of smartphone users sticking exclusively to conventional calls.

Today's the official launch of Windows Phone 7, the Microsoft mobile operating system that was announced in February. The company says Windows Phone 7 devices will go on sale from 21st October in "select European and Asian markets", with the USA seeing WP7 smartphones from 8th November on AT&T. In total, more than 60 mobile operators in over 30 countries have committed to offering Windows Phones.

Research company comScore has published a survey comparing mobile usage and behaviour in Japan, the United States and Europe. It found significant differences between the three regions, with almost twice as many Japanese mobile users using their mobiles to go online (browsing, accessing applications or downloading content) as European users.

Vodafone Global Enterprise – the part of Vodafone that manages the communications needs of larger multinational customers – has acquired two telecom expense management companies: Quickcomm, based in Australia, and TnT Expense Management from the USA. It says these two acquisitions will propel Vodafone into being a leading TEM company for multinational organisations. The total deal has been valued at $9.7 million (just over £6 million).

Apple has asked a judge to stay the verdict and judgment in a patent infringement case because of unresolved issues and a query over the form used to submit the jury's verdict. The company was asked to pay $208.5 million for each of three patents it infringed, although the jury didn't make it clear whether the amount was a total figure or a penalty for each infringement.