Push notifications arrive in a form similar to a text message, to alert you to breaking news even if you are not using the BBC News app at that moment. Our research tells us that users of our apps don't want to be inundated with alerts, so if you sign up for push notifications they will tell you only about the biggest breaking news stories - typically just one or two stories in 24 hours. If you want more than that, another option is to follow our @BBCBreaking account on Twitter where we report on a much wider range of the most significant breaking stories each day.