Legal troubles could threaten Sprint/Clearwire deal: Sprint Nextel’s plan to spin off its WiMax network and form a $14.5 billion joint venture with Clearwire may have hit a speed bump. On Monday iPCS, Sprint Nextel’s largest affiliate, said it will try to block the deal that was announced last week. iPCS, which serves 640,600 subscribers in seven states, said three of its subsidiaries have filed suit in Cook County Circuit Court in Illinois against Sprint for violating an exclusivity contract.

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