How do you top up a sim for your dongle? If i want 3mb can I top up £12.50 or do I have to put £20.00 on the sim.
Also, I have a 3 dongle at the minute, so do I just put the sim into the dongle and it does everything for me or do I need to do anything????(please be aware I am not that computer literate!!!)
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You can topup or add goodybag using your credit card on this web site. (If you want the £12.50 gigabag, you only need to spend £12.50)
Your SIM would need to be unlocked to work with giffgaff.
You would need to change the 3 settings to giffgaff settings but you will find detailed instructions on this site