Why is mobile sending number different to my number?

I recently bought an Iphone and did a sim swap so I could keep my phone number. Everything has been ok. However, when I send an imessage it shows the recipient a different number to mine. I don't think this happens when I send a SMS. Presumably it's the original number for the new sim? Why is this?

Imessage has nothing to do with your sim number it uses a code (a number) to identify your phone. It is not your number, it is the phone's.

It's nothing to so with the phone. You'll have to contact your network operator and explain the problem as they may not have switched the number correctly.

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