Actually this is the one of the things that annoyed me about WhatsApp - when it is down or you don't have a connection you can't queue messages to be sent. I fr

Actually this is the one of the things that annoyed me about WhatsApp - when it is down or you don't have a connection you can't queue messages to be sent. I frequent places without phone coverage (e.g. the Tube in London) and this was one of my big gripes. On iOS Facebook, iMessage and SMS allow you to queue messages and "Retry" sending them when you have a connection (often in the wrong order). Surprisingly the best app for this is Skype which automatically resends them.