Do you have a resolution? I have the same problem, contacted the help
chat, they couldn't do anything then registering the problem with their
technicians, I am not sure how long do I have to wait... if there is a
easy fix???
I cannot listen voicemail, I cannot call 901, 1750, 1760, 202 or any
other short numbers from o2. The guys on the chat help section couldn't
help as well. I have re-booted the phone, reseted the network settings,
removed the sim card and put it back ...