Telecom operators have established 5G trial sites in Gurugram, Bangalore, Kolkata, Mumbai, Chandigarh, Delhi, Jamnagar, Ahmedabad, Chennai, Hyderabad, Lucknow, Pune and Gandhi Nagar, and these metros and big cities will be the first places for the launch of 5G services in the country, in 2022, a DoT release said on Monday.