Stock upgrade buoys Sprint

Shares in Sprint Nextel Corp. rose 2.4 percent after Nomura Securities upgraded the stock, citing cost savings from the company’s network improvement plan.

Government study urges safety review of cellphones

Cellphones — and their use — have come a long way in 16 years. But federal safety standards haven’t budged. Reason enough, according to the Government Accountability Office, to reassess how much radio frequency energy mobile phones should be allowed to emit.