When I've bought prepaid cards, I either bought them for zero-value or with pre-stored value, and in either case they were not usable until I registered them on

When I've bought prepaid cards, I either bought them for zero-value or with pre-stored value, and in either case they were not usable until I registered them online. I haven't found any prepaid cards yet that do not follow this pattern. If you have then I would be quite delighted if you shared.