For Vodafone UK domestic and O2 UK domestic lines only you can view your CDRs in the MyeSIM portal. It is not possible to see your CDRs for Travel products. You can still see how much data a Travel plan has used under View Data Usage (see How do I check how much Data I have left?).
This will allow you to see what calls you have made/received, SMS's sent and received and where you have used data.
For EE lines, you can SMS ‘BAL’ to 888 at any time to see your remaining balance.
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