Ernest Doku of mobile phone comparison site, Omio.com told Express.co.

欧内斯特扎夫手机性价比网站Omio.com告诉本网站：“导致手机过热的原因不仅仅是一个”

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Last month Doku Umarov, a terrorist leader and the self-proclaimed emir of the north Caucasus, warned that war was coming to Russia's cities.

上个月，自封的北高加索地区埃米尔、叛军头子乌玛·洛夫警告说，俄罗斯的城市即将陷入战火。

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Chechen rebel leader Doku Umarov claimed responsibility for the Moscow bombings in the name of Islam.

VOA: special.2010.04.03

The most recent Chechen claim of responsibility was posted on the Internet on behalf of separatist leader Doku Umarov.

VOA: standard.2009.12.12

Meanwhile,Chechen Islamist rebel Doku Umarov, dressed in a military camouflage jacket in a wooded location,claimed credit for the Moscow subway bombings in an Internet video posted on Wednesday.

VOA: standard.2010.04.01

Its overall leader, Doku Umarov, is a veteran Chechen guerrilla who claimed responsibility for the 2011 bombing of Moscow's international airport.

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Its overall leader is Doku Umarov, a veteran Chechen guerrilla who claimed responsibility for the 2011 bombing of Moscow's international airport.

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Ernest Doku, telecoms expert at comparison site uSwitch.com, said with speeds now seven times faster than 3G, it could convince more mobile users to move to 4G.

BBC: 4G mobile broadband speeds 'doubling', says EE