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Today's Tech: Vodafone announces same August 4G launch date as O2 and Apple's iPhone is embarrassed by young Chinese firm Xiaomi

Vodafone has announced it will be switching on its 4G service on 29 August, the same day as rival O2. As an extra incentive for consumers to opt for Vodafone Red 4G, the company are throwing in either Spotify Premium or Sky Sports Mobile TV with all plans. Similarly to O2, Vodafone's 4G launch will be geographically limited, with the service being available only in London on the date. O2's 4G network will be available in Leeds and Bradford, as well as the capital. For those who already have a 4G enabled phone, SIM only deals will start at £26 a month with a twelve month contract. Phone inclusive plans will start at £34 a month for a 24 month contract. Existing Vodafone Red customers will be able to upgrade their tariff to 4G for an extra £5 a month without entering into a new contract.

Despite only launching its first device in just 2011, Chinese smartphone maker Xiaomi Tech has already overtaken Apple in the People's Republic, pushing the US company to the bottom of the pack in the country. Meanwhile, Samsung remains on top with a 17.6 per cent market share, having shipped 15.5 million smartphones in the second quarter of 2013, according to new figures released by Canalys. Rising star Xiaomi took a five per cent share, shipping 4.4 million devices in Q2 2013. In the same period, Apple shipped just 4.3 million iPhones, taking a 4.8 per cent market share. Lenovo, which also produces ThinkPad laptops, took second place, shipping 10.8 million devices. The Chinese firm's formula of producing budget smartphones alongside higher end models offering similar functionality to iPhone and Galaxy devices, but at half the price, appears to have proved hugely successful. Some of its devices are produced in relatively low numbers so as to optimise value for the end-user, and often sell out within half-an-hour.

Yahoo says it will be unveiling a new logo next month and has started a teaser campaign before finalising the design. Kathy Savitt, chief marketing officer at Yahoo, said, "Over the past year there's been a renewed sense of purpose and progress at Yahoo, and we want everything we do to reflect this spirit of innovation. While the company is rapidly evolving, our logo, the essence of our brand, should too." The company has now started a "30 days of change" period in which it will display different variations of the logo on its homepage. One thing that is for certain is that Yahoo will be keeping the colour purple and the exclamation mark on the logo - which is known to annoy some.

The Prism scandal could cost the US cloud computing industry up to $35 billion (£22.5 billion) over the next three years, a new report has claimed. The revelations about the extent to which the NSA accesses private electronic information held by US Internet giants is likely to have an immediate and lasting impact on the competitiveness of US companies, according to the Information Technology & Innovation Foundation (ITIF). The greatest risk to the industry comes from the possibility of foreign customers deciding that the risks of storing data with a US company outweigh the benefits. The fact that cloud computing is still such a rapidly growing industry means that the impact on US companies could be particularly acute, as commercial services are still relatively young. "If European cloud customers cannot trust the United States government, then maybe they won't trust US cloud providers either," said Neelie Kroes, European Commissioner for Digital Affairs recently. "If I am right, there are multibillion-euro consequences for American companies. If I were an American cloud provider, I would be quite frustrated with my government right now." At the very least, the ITIF predicts a $21.5 billion (£13.9 billion) loss to the US industry over the next three years.