I am on Boost Anytime for 12 months but have run out of data but have months left on my plan.

[Cybella]

Boost Anytime for 12 months

I have months to go on this plan for 12 month but have run out of data. I only require extra data as the calls and texts are fine how do I buy or recharge data only?

[pvandenh]

You can get additional Australian data as an "add on". https://boost.com.au/plans/#Plans_add_ons

Note it isn't as good value, and the expiry is only 28 days before you have to do it again.

Better value option is to recharge your yearly plan early, but note it also resets your expiry date to 12 months from the day you do it (so you are forfeiting any plan expiry you have now).