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Hi @Mannzs61 ,
Welcome to the community!
I assume you are pertaining to TPG Mobile data, If you reach your monthly included data, $10 will be automatically deducted from your Prepaid Balance to add a 1GB extra data block.
We did an article that you may find helpful please see the link below.
How to add a data block to your TPG mobile service
@Mannzs61 wrote:With $5/- how many gigabyte do i receive