Allows installation of home screen shortcuts.Write (but not read) the user's contacts data.PowerManager WakeLocks to keep processor from sleeping or screen from dimming.
Open windows using the type TYPE_SYSTEM_ALERT, shown on top of all other applications. Ignore your battery optimization settings. Monitor incoming SMS messages, to record or perform processing on them. Monitor incoming MMS messages, to record or perform processing on them. 
Get notified that the operating system has finished booting. Manage the list of accounts in the AccountManager. Access the list of accounts in the Accounts Service. Send information about completed downloads. Required to be able to access the camera device. Initiate a phone call without going through the Dialer user interface for the user to confirm the call being placed. Act as an AccountAuthenticator for the AccountManager. Access information about Wi-Fi networks. Access coarse (e.g., Cell-ID, Wi-Fi) location. Stay logged in so you never miss a message. Turn off notifications when you're working, sleeping or just need a break. Create shortcuts to get to any conversation right from your home screen. See who's available on Messenger and who's active on Facebook. Turn on location to let people know when you're nearby. Search for people and groups to quickly get back to them. Forward messages or photos to people who weren't in the conversation. 
Extra features: Know when people have seen your messages. Record voice messages when you have more to say. Preview your gallery photos and videos without leaving the conversation-then choose the perfect ones to send.
Otherwise, standard data charges apply.) Even more ways to message: Bring your conversations to life with stickers. Free calls: Talk as long as you want, even with people in other countries. Chat heads: Keep the conversation going while you use other apps. Photos and videos: Shoot videos and snap selfies or other photos right from the app and send them with one tap. Name them, set group photos and keep them all in one place. Group chats: Create groups for the people you message most. Not just for Facebook friends: Message people in your phone book and just enter a phone number to add a new contact. Messenger is just like texting, but you don't have to pay for every message (it works with your data plan). Instantly reach the people in your life-for free.
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