What do the notifications say?
All are prefixed by "Vault (x): "
- One of your Dwellers has been out in the Wasteland for a while, you should check on them.
- A baby is about to be born in your Vault!
- One of your babies has grown into a healthy Dweller!
- Something happened in your vault!
- One of your production rooms is ready for collecting!
- One of your Dwellers has been out in the Wasteland for a short while. Perhaps you should check on them.