Here are the smartphones which are getting the latest Android Lollipop 5.1.1 OS.

Samsung Galaxy S4

Team Android reported that BlissPop, an Android mobile device custom ROM developer community, has unveiled a brand-new Android Lollipop to Samsung's Galaxy S4. BlissPop's custom ROM is based on the latest AOSP (Android Open Source Project) 5.1.1 Lollipop, and is equipped with new visual features and customization options.

According to the news outlet, the BlissPop custom ROM comes with an Audio FX Equalizer, a CM12 Theme Engine, live display, and Display and Light options including smart cover, adaptive brightness, double tap to sleep, battery light.

Other features include a Notification Drawer, Notification Manager, a gesture option for location and trigger region, a Status Bar, and a Lockscreen drawer which contains a long-press Lock icon that can put the device to sleep mode, Team Android listed.

For more info, check out Team Android's report.

Samsung Galaxy S3

Samsung's Galaxy S3 is also getting an Android Lollipop OS update thanks to Euphoria OS, a custom ROM based on AOSP.

The new custom release boasts of new features in its changelog, including a merged android-5.1.1_r3 - android-5.1.1_r4, merged in CM translations, DeskClock, updated dashboard icons, double tap to sleep option, OS panel Task Manager, WindowManager in DPI customization, and a feature that prompts SIM PIN if the lockscreen is disabled, International Business Times listed.

Moto X

The Moto X is also getting an Android Lollipop OS update from Dirty Unicorns Custom ROM, Yibada reported.

Motorola product manager David Schuster revealed via his Google+ account that the soak test for Android 5.1 OS update in Moto X 2013 is rolling out.

"Hey guys, quick update here for Moto X (1st Gen)," said Schuster, as quoted by Yibada. "We have started full soak testing again in the U.S. on the 5.1 Lollipop upgrade for our retail channels. If the data looks good, we'll move to full deployment in about a week.

Schuster added that the company has recently kicked off a full soak test for Brazil retail and Rogers in Canada for the Moto X (1^st Gen), the news outlet noted.

For instructions on how to install the update on your smartphone, refer to Yibada's report.

HTC One X

HTC One X's Android Lollipop OS update comes from Resurrection Remix, a separate report from Team Android wrote.

Some of the features included in Resurrection Remix's update are: Gesture Anywhere, App Circle Bar, Navigation Bar modifications, CM Audio FX, Quick unlock, LCD Density, every CM12 features, Expanded Desktop Mode, and Keyboard Cursor Control, Team Android listed.

For more info about the latest update, check out Team Android's report.