Apologies i was tired when i wrote this, i have a Nokia Lumia 520 and have tried calling 901 but it won't let me do anything as voicemail number is missing
When you dial 901 in your phone, and press "call", what happens next?
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Currently using: Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)