My number has been out of service since yesterday. Called customer service this morning, they told me there was a problem with the network yesterday which made many SIM cards to expire. They said the problem was being worked on but were unable to say when it would be resolved. I was told to keep switching my phone on and off. I explained it is very important for my business to have my mobile back in service asap and asked if I could go to an O2 shop, get a new SIM card (at O2's expense) and have my account (inc. number) transferred across. I was told that would not be possible. I asked to speak to a supervisor but was told it would not be possible, that they would take my number and a supervisor would call me back within 24 hours.
This is a very bad situation made worse by poor customer service response. I am considering moving to another provider.