Photo taken on May 30, 2019 shows A 5G network logo on the screen of a mobile phone in London, Britain. Mobile network operator EE said on last Wednesday that it would launch Britain's first 5G service in six major cities on May 30th. (Xinhua/Alberto Pezzali)

Photo taken on May 30, 2019 shows the logo of 5G network in London, Britain. Mobile network operator EE said on last Wednesday that it would launch Britain's first 5G service in six major cities on May 30th. (Xinhua/Han Yan)

Photo taken on May 30, 2019 shows the logo of 5G network in London, Britain. Mobile network operator EE said on last Wednesday that it would launch Britain's first 5G service in six major cities on May 30th. (Xinhua/Han Yan)

An EE advertisement appears on a newspaper on the day the mobile network operator has officially launched the 5G service in London, Britain, May 30, 2019. Mobile network operator EE said on last Wednesday that it would launch Britain's first 5G service in six major cities on May 30th. (Xinhua/Han Yan)

A poster at an EE store is pictured on the day the mobile network operator EE has officially launched the 5G service in London, Britain, May 30, 2019. Mobile network operator EE said on last Wednesday that it would launch Britain's first 5G service in six major cities on May 30th. (Xinhua/Han Yan)

An EE store is pictured on the day the mobile network operator has officially launched the 5G service in London, Britain, May 30, 2019. Mobile network operator EE said on last Wednesday that it would launch Britain's first 5G service in six major cities on May 30th. (Xinhua/Han Yan)