A Credit Suisse report finds less than one-quarter of AT&T iPhone users would switch to Verizon Wireless upon the carrier's loss of exclusivity, a finding that led the firm to upgrade AT&T's shares. But another report, from Deloitte, found almost half the respondents would be "very interested" in switching carriers, a figure that AT&T CEO Randall Stephenson dismissed because most users have family or business plans.

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