How comes you can only roll over a max of 1gb. I have a Sky sim and it lets you rollover all your data. I currently have over 20gb saved in the sky sim.
Have a look at https://www.virginmedia.com/help/virgin-mobile-data-rollover explains the rollover, Sky is different of what Virginmedia offer, there is no limit on what you can rollover, but the data rolled over will expire in the month that it rolled over too.
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