Bharti Airtel has launched 4G services in Gujarat, Madhya Pradesh and Chhattisgarh. The operator will be offering services in these states through the 1800 MHz spectrum band. The operator is also offering a free upgrade to a 4G SIM to its customers to use the new services on their existing 3G plans. Airtel 4G services are now available in 18 circles of a total of 22 circles in the country.