Hello Mac Rumors community! Long time lurker here : )
I have AT&T here in Hoboken, NJ just across the river from Manhattan. Since I've switched to the iOS 11 beta on my 7 Plus and especially with the latest update, I've been experencing extremely slow LTE speeds. I guess you can't even call...
Since beta 4 update, for almost all apps (Messages, Whatsapp, Telegram, Messenger etc..) read notifications remain marked as unread, keeping the badge icons in the homescreen and even inside the apps messages/conversation stay as unread.
A way to remove them is to manually mark them as read...