O2 Account / Old & New Numbers

[Scott_F]

I bought a new phone, which had a new SIM with it. I've put my old SIM in my new phone, but on my O2 account it says the number of my devise is from the new SIM I haven't even opened. How do I get them to change it to my old number/SIM that I'm still using in my new phone?

[MI5 · Accepted solution]

@Scott_F 

You need to call O2 to migrate your number to the new contract and end the old one Guide: Migration & porting into O2