Without a doubt my most used app, I use it every day for calls, messages and group chats. However, I got a new phone. I backed up all my chats on the old phone as instructed. Downloaded the app on the new phone, added my number, which hasn't changed, clicked restore for all backed up messages and... Nothing! Everything is lost. This is a huge problem and needs addressing. What is the point of having a back up function if it does not work?!