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@skyguy you will have the 1GB until all used up
When you regular monthly data is used up, the system will start using from the 1GB add-on you have. Any leftover will roll over to the next month and ready to be used again when the regular data are used up again
All purchased add-ons remain on the account until they are fully consumed.
The only add-ons which do not are the US roaming add-ons, which have an expiry indicated during the purchase process.
@skyguy you keep it till it’s used , will roll over