Reportedly, the mobile carrier has been sued for charging extra to the customers, who access data through Apple iPhones and iPads.

“AT&T is facing a federal class-action suit alleging that it systematically overstates the amount of data used on each data transaction involving an iPhone or iPad,” informed a source.

Patrick Hendricks filed the suit against the firm and said that a consulting firm he hired, found that the company overstated the data usage rate by 7 to 300 percent, for the iPhone and iPad users.

Charges against AT&T

“The reshuffle underscores how quickly Google, which offers its software to phone makers for free, has raced to the top of the smartphone market ahead of Apple Inc's (AAPL.O) rapid ascension. Google and Apple have revolutionized the smartphone market, sending Nokia scrambling,” said a market analyst.

A report by the research company Canalys has revealed that in the fourth quarter, nearly 32.9 million Android-based phones have been sold, while only 31 million Symbian-equipped phones were sold, by phone manufacturers.

It was learnt that Verizon would be offering its customers unlimited data usage plan, through an ‘unadvertised loophole’, now even AT&T has started providing its existing users having limited data usage plans with the unlimited package, so that they don’t run to Verizon.

An AT&T customer Jose Argumedo, who lives in Brentwood, N.Y., said that after a call to the AT&T customer care recently, he was switched on to the unlimited plan.