Payola. Pushing handsets, many of which seem destined to become abandonware. Continuing to promote the practice of carrier-only handsets. The financial incentive will be enough for some carriers to ignore other handsets or features.

It's a game Apple can play as well, but I really hope they don't. Though I won't hold my breath for any dramatic changes in the carrier status-quo.
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Bruno
Twisted Melon : Fine Mac OS Software