Nokia 6310i

[wendyl]

I have a problem with my mobile. I recently used it on holiday with vodaphone passport in various countries. Now home I have removed it. Part way through the holiday when trying to send a text message I just got '? operator services' in the window and although I have been through the handbook I am unable to sort it also 'pager' is showing in the window when it is on which it never used to and I have been unable to change this either. Can anyone point me to a website or instruct me how to resolve please many thanks