Most mobile networks have sent out Android 5.0 Lollipop updates to more recent smartphones and are now starting to send out updates to much older models. AT&T is updating its models of the Samsung Galaxy S4 and Galaxy S5 as of Wednesday, while T-Mobile is updating its version of the LG G3.

AT&T updated its model of the HTC One M8 Tuesday, while U.S. Cellular updated its Galaxy S5. Owners of older smartphones like the Galaxy S4 and HTC One M7 should expect the Android 5.0 update to hit their devices soon; however, exactly when it will hit depends on the carrier. AT&T is the first U.S. carrier to update the Galaxy S4 to Android 5.0 Lollipop.

AT&T began sending out the Android 5.0 update for its Galaxy S4 Tuesday, having confirmed availability on its support page. The update will be sent over the air, meaning it should reach the S4 handsets wirelessly. Users should be prompted to update their devices automatically once the software hits, but they can also access Settings > More > About Device > Software Update to see whether an update is available.

The system build or exact system version is called LRX22C.1337UCUGOC3. As a major update for the Galaxy S4, going from Android 4.4 KitKat to Android 5.0.1 Lollipop, the software brings a lot of changes. Included are a new interface look and feel with Material Design, Priority mode, which allows users to set the notification they want to receive, battery-saving features, smart Lock and syncing with other Android devices.

Lollipop also lets users access their most frequently used settings by swiping twice downward from the top of the screen. The update takes up about 947 MB of memory on AT&T Galaxy S4 handsets.

AT&T also began sending out the Android 5.0 update for its Galaxy S5 Wednesday, having confirmed availability via Twitter. The update will also be sent over the air and can also be accessed manually through Settings > More > About Device > Software Update. The system build or exact system version is called LRX21T.G900AUCU3BOC4 and brings many of same features to the Galaxy S5, as it does to the Galaxy S4.

T-Mobile also began sending out the Android 5.0 update for its LG G3 Tuesday, having confirmed availability on its support page. The software version is D85120b and brings updates to the device including VoLTE and Wi-Fi Calling 2.0.

Meanwhile, Google Play Edition devices including the HTC One M8 GPE and the LG G Pad 8.3 GPE are receiving the Android 5.1 Lollipop update as of Wednesday. The update addresses a number of bugs on the original Android 5.0 operating system.