We are still in the early days of the world-changing impact of mobile phones. But they are just one part of an overall trend toward increased human mobility.
First, for people in the cloud, we have less stuff and the stuff we have is less important. As software eats the world, atoms turns to bits, and there are simply fewer objects that one needs to own. Without a house full of things, and with the world increasingly united by a global network, the dream of taking off with nothing but a backpack has never been easier to realize.
Second, mobility of association and identity. Rather than gaining our purpose and identity from the tribe we were born into, we belong to many geographically-dispersed groups chosen based on personal interests and goals. This has profound implications for other long-standing social pacts: marriage, family, permanent employment. All of these will undergo change as mobile individuals invent new types of relationships, ways of making money, and, ultimately, meaning in their lives.
The objects to buy and fetishize will be (besides the obvious mobile phone), noise-cancelling headphones, versatile backpacks, external batteries. But the real holy grail will be multiple passports. And in the absence of government-issued passports, easier ways to gain access to local services, no matter which land you happened to be born in.