As per Airtel, iPhone 5s and 5c device users can now avail the services. Curiously, Xolo LT900 and recently launched Gionee Elife E7 too support the 2300 MHz frequency band on which 4G is being offered by Airtel.

So if you have the iPhone 5s or iPhone 5c, update your SIM to a 4G SIM card to avail the services. Moreover, Airtel has announced that 4G services will be avaialble at existing 3G pack prices. For heavy data users, Airtel has also announced a new 4G plan giving customers 10 GB 4G data for Rs 1000. While data browsing will be on 4G network, voice calls will be routed on 2G/3G seamlessly with the CSFB (circuit switched fall back) technology.

"Airtel's 3G customers in Bengaluru on iPhone 5s or 5c can start enjoying 4G speeds at same price points as their existing 3G plan/pack. Customers on 2G/GPRS data plans/packs can also opt for any of the 3G plans/packs available and enjoy 4G speeds," the operator announced in a press release.

Airtel also offers 4G via dongle in Kolkata, Pune, Chandigarh, Mohali, and Panchakula. So expect 4G mobile services in these circles soon as well.

With 4G, you can ideally achieve 100 Mbps speed. Airtel on its web page also says that with 4G, you could have 5 time faster internet connectivity than 3G but according to The Economic Times, Airtel 4G in Bangaluru provides 7.2 Mbps download speed.