Why Samsung Androids? Because right now they’re the cheapest phones in their segments. To put it mildly, economy of scale applies to the Android device market — and the absence of any royalty payments for the OS is a nice extra. Operators make more money by selling their clients Androids than on iPhones, BlackBerries, Nokias, and all the rest.
Thus, once consumers arrive in the operator store the clerks efficiently steer them toward the Samsung Androids that make everybody most money. (Unless the consumer demands an iPhone, of course. That short-circuits the plan.)
Many consumers don’t particularly want to surf on their phones, because they don’t see the point and they think it’ll cost them a lot of money (and, especially in the developing world, they are likely right). A friend of mine, who recently got a mid-range Samsung Android with his new contract, explicitly asked me to turn off his Internet access because of the cost.
What I think is happening is that consumers who in the past would have been happy with a mid-range Nokia are now buying mid-range Androids. They don’t really care what kind of phone they have, so they’re willing to take a Galaxy, especially if it’s “free.” But they won’t surf. That’s too expensive.