Users in the top 5 per cent of AT&T traffic are reportedly seeing their data speeds cut all the way back to 2G speed as the network provider has started throttling its heaviest data users.

According to CultofMac, AT&T has alerted heavy users of its move via text message stating, “Your data usage is among the top 5 percent of users. Data speeds for the rest of your current bill cycle may be reduced.”

The move comes as no surprise. Back in July, AT&T had made it clear that it would throttle speeds for heavy data users from 1st of October.

The network provider didn’t explain how much data is being used by an average heavy user in the top 5 per cent. It only said that users in the top 5 per cent consume nearly 12 times more data than the average customer.

However, the move affects only customers who are on unlimited data plans. Customers on limited data plans who cross their data limits are just charged for the extra data.

Subscribers with 4GB per month data plan are also unaffected by the move. But, they too liable for overage fees once they cross the limit of their data.

Meanwhile, AT&T’s Chief Financial Officer John Stephens announced that the mobile phone carrier and Deutsche Telecom were determined to pursue and complete the controversial $39 billion T-Mobile transaction.