Airtel Dongle Kolkata Mifi Platinum 3G Smart Phone U900 MHz As rare as Platinum, Airtel launched Platinum 3G in Kolkata || U900 MHz || But is it affordable ? Saturday, January 30, 2016 Airtel launched own 3G services in Kolkata in April last year on the 900 Mhz spectrum, which will offer better speed than when these... Saturday, January 30, 2016 Airtel Dongle Kolkata Mifi Platinum 3G Smart Phone U900 MHz