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(context: While SBC and BellSouth Corp. are focused on helping combine AT&T Wireless with Cingular, which SBC and BellSouth co-own, SBC might not be finished. )
What does "SBC might not be finished" mean, esp. the word "finished"? And what does "while" mean here? I don't know the logical relationship between the first part of the sentence and the last part of the sentence.
SBC might not be finished. 
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