Port and no signal

[Ozman]

Hi everyone, I ported from Vodafone yesterday at around 1100. I saw my number go on the SIM details and it's on the app as my number but about half an hour later I lost all signal. Waited until 1800 and rang customer services but told to wait 24hrs. I've tried the SIM in another phone and still no signal and I've tried my old Vodafone SIM in my phone and it gets signal. Any ideas what the issue is? 

[MI5]

@Ozman 

You need to insert O2 sim and reset your network settings.