Message not sent: service not activated on network

Hi all. any genius' out there that can help?
Receive texts from friends, lengthy and full of emojis but when I write a text with an emoji or two, the above message comes through so I end up copying, pasting then cutting some out and pasting as a continued message ... anyone else experiencing this and is there a get around as it's becoming really time consuming , Cheers in advance, Neil

I have same problem mate , I think its classed as a picture message when you add them which won't be in your plan , not sure how to get them added though, although for some reason it seems to work sometimes

Same happened to me. I contacted lebara via chat. Explained my issue. I did have to send them screenshots. Because they did try saying it was the other person's phone. But I tried multiple contacts. Then, while waiting for another excuse, my messages all went through. They did something their end. Very odd.

Yep me too, I am a total noob with these smart phone things so I am not sure if this will help! :-
How I solved my problem,
I had two smiling face symbols in the on-screen keyboard area, one to the right of the texting/typing area which offers up a host of small emoticons to choose from to add into the line of text and are ok to use in an SMS text.
The second one is to the left of the space bar and brings up another screenful to choose from but this time the top row are slightly larger and are called Emoji Kitchen, these are the ones that prevent the text sending,
Unlike DebbieC2 I have not yet mastered the art of taking a screenshot which would have saved all thisTLDR !
check your apps for one called Emoji Kitchen
hth!

Thank you all, really appreciated.
Did manage to eventually speak to someone at Lebara and they kindly informed me that I only have 160 characters to use along with the fact emojis (as pointed out) are classed as picture and the only way around this is to buy a £5 pack which gives me freedom to do what I want but at £0,45 per message.
Unfortunately Facebook have allowed their damn AI to permanently disable my account so I have no access to WhatsApp/Messenger etc of which the whole world seems to rely on (as did I !!) and that's another battle I'm fighting to find out why ... you can't get to a human though! great!!
Cheers for your input folks, great to know there are people out there willing to offer help or condolence ... take care. Nx