Hi @Louisag, an update on this. There's no fix yet but @O2Simon PMed me and looked into it but was unable to sort it, so he raised it with the IT team. They called me this morning and asked a few followup questions and he's not raised it with another team. The IT guy told me it's the first time he's heard of this problem, but if more people report it it will get better priority for being looked into, so please get in touch with Customer Services or one of the O2 team here and get it raised if you haven't already. This applies to anyone else who is having this issue right now.
For clarity I've tried the following so far:
Installed Whatsapp on my new phone (Android) and requested an code via SMS and a callback numerous times with the usual messages of having to wait to try again. Nothing received and no success.
Put my sim in a different phone (iPhone), installed Whatsapp and requested an SMS and callback. Nothing received and no success.
Had a friend who's with a different provider (Vodafone) uninstall their Whatsapp, reinstall it and enter my number for the code and callback requests. I didn't receive anything and the usual messages were shown after a couple of attempts. When they entered their number they received an SMS immediately and logged back in to their account fine.
This last test suggests to me that the SMSs and callbacks are being blocked when being sent from Whatsapp imo but we'll see what O2 come back with.
