"There are four major stakeholders in the Android smartphone market: the cell carriers, the consumers, the handset makers, and Google. The carriers want smartphones to be locked-down carrier-controlled devices through which customers obediently buy services on carrier terms. All the other stakeholders, by contrast, gain from unlocked devices. Consumers win because they’re not limited to what the carriers choose to provide them; handset makers win because an unlocked phone is more valuable to a consumer than a locked one (and a little less expensive to ship, too); Google wins because its long-term strategy requires it to commoditize the carriers into a passive channel between the customers and Google."
More at http://esr.ibiblio.org/?p=3285