Are you looking to take advantage of Family Data sharing (all phone on the same account share the total data) or just wanting your partner to be able to phone Optus and do admin stuff? Short Answer though is : Yes
Ok. Just contact Optus and add him to your account as an authorised person. He can then handle most admin stuff. However only one person can be 'responsible' for your account (i.e. paying the bill). You can transfer that to your partner or keep it yourself.
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