User Activity

I can not find in my O2 account my usage history. I am especially interested in SMS sent out, as I suspect a mobile app sending out SMS automatically without my content? How can I find out the number of SMS sent out and preferably even the contents o...
Why do I constantly get "Sorry, your number doesn't support Visual Voicemail, so we can't set it up yet. Please contact your service provider for help." messages? How to disable them without enabling visual voicemail?
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