Porting my number from O2 to O2?

[Abbafan1972]

Hi there, 

I am currently on a sim-only deal with O2.  The shop told me I could upgrade at any time, but failed to tell me that If I wanted to change networks and port my number, I would get charged £149.99 early cancellation fee (this was confirmed by O2 chat last night).  The contract comes to an end 2/4/2019.

Anyway it's worked out cheaper for me to start a brand new contract (with O2) from Carphone Warehouse and I got a good online deal not available in the shops. 

I would like to keep my number and my question is can I port this number from an O2 to an O2 account?  If this is not possible then I am happy to have the new number someone else in my household can use my sim-only until it comes to an end and then I dump it and get a giff gaff one for them (much cheaper). 

Looking forward to your reply.

Thanks in advance.

[MI5]

If you specifically told the store you were waiting a short period of time to upgrade, they shouldn't have locked you in to 12 months in my opinion.