Unexpected charges on bill

[NickiS1]

I’ve just checked my monthly phone bill and see I have ‘bought’ 2 items 1x£11.99 and 1x99p - however I do not know what I’ve bought/don’t recall buying anything - is there a way of finding out what I’ve paid for? 

[Bambino]

@NickiS1 See if anything in the links below help:

Have you fallen for or been conned into a premium ... - O2 Community

Phishing, Smishing & Scams. Latest info & advice. - O2 Community

The O2 guide to premium SMS numbers - O2 Community