While the more efficient 900MHz bandwidth is particularly suited for indoor coverage - increasing its attractiveness for operators - India's No. 2 operator will also be interested in the 1800 MHz bandwidth which can later be used to offer fourth generation (4G) telecom services. Both Jio and Bharti have bandwidth in the 2300 Mhz to offer 4G services, but Vodafone doesn't. So far, Jio hasn't started its 4G services - which allows downloads almost 10 times faster than 3G, while Bharti Airtel offers it in a few cities. Hefty earnest money deposits for auctions starting February 3 by Vodafone India, Bharti Airtel, Reliance Jio and Idea Cellular indicate that all four could be part of a major slugfest in Delhi and Mumbai circles in the 900 Mhz band, say analysts. Some key circles in 1800 Mhz band could also see keen fights for airwaves. Vodafone holds 900 Mhz airwaves in the lucrative circles of Mumbai and Delhi, apart from Kolkata.