Given PAC code to port number, can't change number in iPhone setttings

[madeoutofsound]

I have given my PAC number to switch from GiffGaff to O2, and my old sim disconnected, showing "No Service". So I thought, great, the new SIM should work with my old number.

I put the SIM in, and it shows the temporary O2 number. When someone tries to call my old number it says "The number you have called is not recognised".

I have tried:

Resetting network settings (this is the closest I got - it showed my old number for a few minutes, but then changed back again to the temporary o2 number).
Turning off iMessage and FaceTime, powering off the phone for 10-15 minutes, and powering on again.

When I try to change the number and press "save" it just doesn't recognise this and reverts to the temporary number.

Super annoying!

[MI5]

@madeoutofsound 

You'll need a new blank sim card.

Pop in your local store with photo ID https://www.o2.co.uk/storelocator

Or contact O2 online, but in store is quicker and safer and will not result in a loss of service.

Guide: How to find help & contact O2 

[madeoutofsound]

Right - but I went to a store just yesterday, so why didn't they give me a blank sim then?

I hope my number isn't lost!

[MI5]

Your number is fine @madeoutofsound 

I can't answer why they didn't help yesterday. Maybe just couldn't be bothered?

[madeoutofsound]

So I went to the store, and it started receiving messages and calls by the time I got there. Typical haha.

The only thing that isn't working is iMessage. I'm hoping this should work in time too.

[MI5]

@madeoutofsound 

You'll need to be able to update your number in Settings >Phone >My Number before iMessage will register.

[madeoutofsound]

But if my number is now showing as the old number (as I wanted it to), is there still a need to update it? It's now correct. It's just that iMessage fails to activate.

[Enlli]

iMessage often takes time to catch up with changes

[MI5]

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@madeoutofsound wrote:

But if my number is now showing as the old number (as I wanted it to), is there still a need to update it? It's now correct. It's just that iMessage fails to activate.

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@madeoutofsound 

As long as your number is showing correct it will activate in a few days time.

Rebooting phone periodically can help.