Unable to send texts to Android phones.

[lapua65]

Hi. I have on odd problem on my phone where I can sometimes send messages to Android phones, but not respond to any. In nearly every case I get the "Not Delivered" message with the red exclamation mark. I have all of the settings as recommended but no joy whatsoever

[pgn]

The guide may help @lapua65 - Guide: Text Message Tips (not sent or received) 

Good luck!

[MI5]

@lapua65 

This is a common issue if you are using an iPhone as the sms delivery system that O2 uses is not an industry standard.

To get an accurate delivery report, you need to precede al sms with *0#