I found this info via Reuters which annouces that NTT DoCoMO is starting a joint venture with MC Donalds to realise mobile payments in Japan at the Mc Donalds restaurants. Together the invest 2,5 million dollar in this. We see more and more of these initiative to realize mobile payments. So your phone will in the future get another functionality. It will become your wallet. This will make your physical money dissappear and will introduce virtual money. Finally I think physical money will not be used anymore.
See also
Reuters.
EXTRA FIELD-5:NTT Docomo, Mc Donalds, virtueel geld, mobiele telefoon, toekomst, innovatie