From am zhan, they are trying out a delivery service. one analyst say it could be like creating a virtual walmart. >> christine romans joining us now, talking about the credit card at some point being obsolete. it can get in the way. what's going to replace it? >> imagine plastic going away in a year, maybe two years, maybe three years and having a mobile phone wallet. you're already seeing this. you can bump phones with people and transfer money. you can buy starbucks and other things with your mobile phone. i just did this for the first time on friday. i got on an airplane with my blackberry...