https://community.o2.co.uk/t5/Pay-Monthly/Data-top-up/m-p/1051726#M128770 Call customer service on 202 from the phone in question and ask them to block bolt ons. Sun, 21 May 2017 13:42:38 GMT MI5 2017-05-21T13:42:38Z https://community.o2.co.uk/t5/Pay-Monthly/Data-top-up/m-p/1051723#M128768 <P>Can I set a block so my daughter cannot add extra data to her monthly allowance?</P> Sun, 21 May 2017 13:20:15 GMT https://community.o2.co.uk/t5/Pay-Monthly/Data-top-up/m-p/1051723#M128768 Anonymous 2017-05-21T13:20:15Z https://community.o2.co.uk/t5/Pay-Monthly/Data-top-up/m-p/1051724#M128769 <P>@Anonymous&nbsp;You cannot put a block or cap on data but you can keep an eye on the usage in your myo2.&nbsp;</P> Sun, 21 May 2017 13:25:26 GMT https://community.o2.co.uk/t5/Pay-Monthly/Data-top-up/m-p/1051724#M128769 Anonymous 2017-05-21T13:25:26Z https://community.o2.co.uk/t5/Pay-Monthly/Data-top-up/m-p/1051726#M128770 Call customer service on 202 from the phone in question and ask them to block bolt ons. Sun, 21 May 2017 13:42:38 GMT https://community.o2.co.uk/t5/Pay-Monthly/Data-top-up/m-p/1051726#M128770 MI5 2017-05-21T13:42:38Z