swich to "pay as ypu go"

[eneto78]

Hi. I write you regarding my contract change. I swiched my contract form pay monthly to pay as you go, to keep my old number. Now, in my "my O2" account I have two numbers related to it:

-First one, my current phone number which is "pay monthly".

-Second one, new phone number which is "pay as you go".

I have received as well two different SIM after my contract change. One of the is "O2 Pay as you go £10 Data Big Bundle Triple Sim" and the other is "O2 Pay as you go 4G Warranty Triple Sim".

I would like to ask you to clarify this situation, please. I would like to keep my current number on the new "pay as you go" phone plan. I would like to know which of the two new SIM card shall I use once my old "pay monthly" finishes working on the 28th July.

Thank you for your time

Regards

[MI5 · Accepted solution]

@eneto78 

You'll need to call customer service to migrate your number which will cancel your monthly sim.
Numbers here Guide: Coronavirus Community Help and Support 
When it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say "Upgrade", "Lost/Stolen" or "Fraud" if you have to, to get put through to someone.
8.00am is the best time to call if you can.

[Chester888]

Hi, sorry for messaging here but I switched my contract to PAYG too and requested for number transfer too. People at O2 must have messed up something with my activation as I am impossible to make phone calls or messages but when I verify an access to a 3rd party the messages all arrive (number must be transferred)
No one can help me as I can't call up or message, do you know why is that?