@Pauloj
As long as both are at the same address you just need to apply for the multisave discount within 28 days of the last contract starting.
Guide: O2 Open & Friends and Family discounts - How to sign up
There is currently no way to joing the contracts but it isn't necessary for the discount.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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