byelaw58 Some texts I send say "Not Delivered !" and they are NOT delivered. Some texts I send say "Not Delivered !" and they ARE delivered. I'm confused and frustrated.
This is interesting as I've experienced the same thing before, try restarting your phone and this makes a fresh connection to the network, also have you tried a delivery report for your texts? All you need to do is type *0# (that's star zero hash) before the neon text message e.g.
*0# meet you at the cinema
*0#meet you at the cinema
it does not matter whether you leave a space or not, and you will get a delivery report back to you phone to confirm it's been delivered' (not necessarily read though) it's 5p per delivery report but you may very well have texts allowances in your goodybag to cover this or it will be free if it's to another giffgaffer (and you have free giffgaff to giffgaff calls/texts)