You need to send important messages to the users of your app via push notifications. You've probably run into this dilemma before.
You could use a native push service to send messages. It's cheap. But standard push messages are "best effort" and delivery can be unreliable. The messages are important and "best effort" delivery could cause problems.
You could use SMS to send messages. But reliability has a price: SMS is expensive.
In this guide we describe how technology helped solving this problem. In particular:
Download it now!