The long wait is over for owners of Samsung's pair of former flagship smartphones running on the AT&T network. The carrier is finally beginning to roll out the Android 6.0 Marshmallow update for the Galaxy S6 and Galaxy S6 edge, making it the final of the big four carriers to do so.

AT&T customers have a right to be frustrated with the carrier, as they are officially the last in line to receive Android 6.0 Marshmallow on the handsets. The update was first expected to roll out weeks ago, when Samsung officially updated the product pages for the devices on its website to reflect the new software upgrade.

Instead, no update was released, to the disappointment of AT&T customers who felt slighted as they watched Sprint customers receive their Galaxy S6 and S6 edge upgrades in March, while Verizon and T-Mobile customers were treated to the new software in early and mid-April, respectively.

The announcement was finally made official on the AT&T support pages for the devices, with the company stating "AT&T will release a software update for the Samsung Galaxy S6 (G920A). This update will be made available to customers to download via firmware over the air (FOTA). Wi-Fi connection is required for update." An identical statement was issued with respect to the Samsung Galaxy S6 edge (G925A).

In addition to the upgrade to Android 6.0 Marshmallow, the AT&T software update also introduces video calling and removes Keeper, AT&T Live, and Facebook Messenger from the handsets. It also adds Amazon to full preload and moves AT&T Mail and YP Mobile to a Virtual Preload, according to the company.