USA based AT&T has started re-allocating some radio frequency from its GSM to its more advanced WCDMA and LTE networks in New York City.

The company said that the move is to deal with "exploding" demand for mobile broadband services in the city.

"Dedicating more capacity to our advanced wireless networks will help more of our customers in New York City have a better experience overall," said Tom DeVito, vice president and general manager for AT&T in New York and New Jersey. "By re-allocating network resources from our 2G network to support our newer, advanced networks, we're moving capacity to support the voice and mobile internet services our customers want."

AT&T added that it has been reaching out to affected customers who use GSM-only devices in New York City to provide them with more details and a variety of options for upgrading their devices, including discounts on new ones while keeping their mobile numbers.