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India's largest telecom service provider Bharti Airtel will start trials of its 4G services in Delhi from June 18.

According to sources, the company has set up the network and already informed the customers having 4G-enabled handsets to get 4G sim cards.

"The company will do the beta launch of 4G in Delhi on June 18," a source said.

The company had started its 4G services in 2012 with the first launch in Kolkata. Airtel's 4G services are now available in several parts of the country including Chennai, Bengaluru, Pune, Chandigarh and Amritsar.

The company has also got permission from the Department of Telecom (DoT) for the launch of its 4G services in Delhi.

It is learnt that the telecom major has tied up with Chinese telecom equipment and network solution firm Huawei for 4G network rollout in Delhi circle.

Bharti Airtel had over 324 million customers across its operations at the end of March 2015, as per data available on its website.

Last month, Airtel had started trials in Mumbai, Chennai and Hyderabad as well. In Mumbai, Airtel will be offering 4G services at the same data charges as its 3G services. The main idea behind the trials is to gather customer feedback and try and improve the quality of the service.

Currently, Bharti Airtel offers 4G services in 19 cities across the country, including Kolkata, Bengaluru, Pune, Chandigarh, Mohali and Panchkula. Airtel has also extended its 4G network in Maharashtra’s Virar, Nalaspora and Vasai.

It had, in January, announced that it plans to launch 4G services in Andhra Pradesh, Himachal Pradesh, North East and Punjab by December 2015, Karnataka by February 2016 and Rajasthan by April 2016.

Bharti Airtel Chairman Sunil Bharti Mittal in March said that the company has plans to double its 4G network by installing about 20,000 more sites in addition to 20,000 sites it already has for 4G service.

With Inputs from PTI