Good mobile apps for exchanging bitcoins seems to me to be one of the keys for the success of Bitcoin, enabling easy exchange of bitcoins in the BTC<->Cash market, and keeping it out of reach of govt.
I can't envision being able to transact in bitcoins using a mobile app in an environment where theyve been declared illegal and not being traced. Can you?
I'm thinking of an app where one person can simply transfer bitcoins to another person. Like a gift. Can the possession or movement of bitcoins be declared illegal?