I too have the same problem. Some texts that are sent to me are not always received. And the person who sends it even gets a delivery report! I see from previous threads that O2 can do a refresh on my phone or else send out a new SIM. Can this be looked into please?
The outstanding texts never came through. Should they have? Some were even sent in the past 24 hours. Will a new SIM be best to resolve the problem?