Mobile phones that use fingerprint and retina scan to verify our identity. They can therefore contain our credit card info, our bank account info...even the "cash" we have withdrawn from our bank into our phones...and info for all the various cards we carry...train passes, office passes, discount vouchers, etc.
So all we have to do is scan the info into our phones, and if we need to make a purchase or use the info which is secure, just place our fingerprint and retina scan for access and then the money or info is accessed accordingly by the relevant external devices...
No need to walk around with big fat wallets!
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