Not able to send SMS messages in iMessages ?

Suddenly I was not able to send SMS messages via iMessages. Tried every possible troubleshooting option, with only 1 working. That was turning of iMessages itself under messages.

However this was not good enough. It disabled internet chat/continuity on my macs and pads etc. So I had to turn this back on.

It took me ages to find this but it was quite simple in the end. ┬áIf your SMS’s are getting stuck. Just click the SMS message that either says ‘failed to send’ or stuck in the sending mode and select ‘Send as SMS’.