AT&T and T-Mobile expected to bid for Verizon's 700MHz spectrum

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Which spectrum use is it that forces new Verizon phones to be unlocked?
I can't see AT&T wanting that.

I do not think this has to make phones unlocked, just there are device interoperability requirements. But, AT&T recently started letting other devices onto its network to meet these requirements (i.e. selling services to devices it has not approved).