o2 text msg not sent, error 0

[stepro1]

I have a Galaxy A14, very good except a number of NHS colleagues can text to me but randomly my replies sometimes fail. There seems no pattern to this. I have tried everthing. However if I put my SIM card in another phone then I can always reply. But when put back in my Galaxy it behaves as before. Anybody else have this? Incredibly tedious.

[MI5]

@stepro1 

Check guide here Guide: Text Message Tips (not sent or received) 

[stepro1]

I have tried these things with no success. now I am trying a different text message app, i must wait to sse what happens.

[MI5]

@stepro1 

I use Google messages app.

Much better than the stock Samsung one.

[stepro1]

Messaging has worked correctly since I switched to using the Samsung text msg App rather than the Google App. I cannot say why, but this is a fact.

[MI5]

@stepro1 

Possibly an error in the settings of the message app but you found a solution, so that's all that matters 👍

[stepro1]

I had been trying to sort this out for three months, I had contacted O2 technical and gone through all phone settings, they spent hours on this.  I used to be a programmer and worked in electronics so am familar with debugging things, intermittent faults are always the worst.