TEXT messages

[ARt_]

I recently purchased a Samsung Galaxy A15 4G Mobile, I am just starting to familiarise myself with its operation. What I need to know is: how to send text messages from my Samsung Galaxy A15 to the same Galaxy A15 ? I have attempted to do this without success, on my old mobile this was straightforward. It would be useful to me if I am able to do this on the A15! On each occasion I have tried it, I get the message "unable to send on EE"; or something similar. Is anyone able to help. 

Best wishes, PM.

[XRaySpeX]

It's unusual for the other party to give you a PIN for you to text to them. Usually they send you a text with a PIN or OTP & you fill it in on their site. Perhaps X is set up not to accept texts or you're replying to a 'no-reply' text, having got it mixed up.

For sending texts, ensure your phone's Messaging app has the Message Centre no. setting for EE as +447958879879.