O2

I am in France and not able to call anybody or send messages I do have internet access though? When I changed to o2 pay as you go I kept my old phone number but my phone is still showing the original number and it won’t let me change it. It was worki...

I need help with making calls and sending texts from France. I have a£10 big bundle with O2. I can use my apps though help please can’t find the answer on O2 app.