My Moto E is rooted and recovery installed. What are the built-in applications are safe to remove ? I want to remove Google play games, music, motorola alert, motorola contextual service etc.
All of those are safe to remove, however you may break Motorola Assist and Motorola Touchless Control by uninstalling Motorola Contextual services if those things are important to you. Also always since you have a custom recovery installed make a backup in recovery before you go uninstalling anything that way if anything goes wrong or you want to restore things to the way they were originally you easily can.
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