After a long holdout, AT&T Mobility has finally agreed to provide Nielsen RingScan with point-of-sale data on its mobile music sales.

The deal means AT&T will now provide both ringtone and ringback tone sales data, which will be included in Billboard's Hot Ringtones and RingMasters charts. RingScan will introduce a weekly ringback tone sales chart later this year.

Nielsen RingScan, which is owned by Billboard parent company the Nielsen Company, also has a point-of-sale reporting agreement with Verizon Wireless.