I have been using new Samsung A51 for a couple of months. Samsung messages worked fine and then suddenly stopped sending texts. Receiving fine.
I changed to another messages app, Google I think, and it worked fine but now stopped sending. Receiving OK.
New phone so not a cache or storage problem. Have done everything suggested online, turned off, reput sim, checked settings. No changed anything that I am aware of. Signal and coverageis very good here.
Can anyone suggest anything please?