Analyst upgrades:

• Merriman upgraded Dendreon (NASDAQ: DNDN) to Buy from Neutral on expectations shares will react positively to the full IMPACT data release on April 28. The firm thinks Provenge could represent the first cancer immunotherapy approved in the U.S. and raised its valuation range on the stock to $33-$34 from $18-$19.
• Piper Jaffray upgraded Andersons (NASDAQ: ANDE) as it believes the valuation is attractive, investor expectations are low, and the company's fertilizer and rail segments could recovery in FY10. The firm has a $19 target on shares. Goldman upgraded the auto sector to Neutral from Cautious and added Ford (NYSE: F) to its Conviction Buy list. The analyst does not believe Ford will have to declare bankruptcy and sees the company benefiting from Chrysler share declines and GM's (NYSE: GM) reduced product offerings. Ford's price target is $6
• Banc of America/Merrill upgraded U.S. Airways (NYSE: LCC) to Buy from Underperform.
• Broadcom (NASDAQ: BRCM) was upgraded to Equal Weight from Underweight at Morgan Stanley.
• Caterpillar (NYSE: CAT) was raised to Overweight from Neutral at JP Morgan.

A new poll shows that the Apple (NASDAQ: AAPL) iPhone, marketed through AT&T (NYSE: T) Wireless, could take more business from competing cell service providers than was previously believed. According to a survey in May of about 11,000 cellphone users by M:Metrics Inc, two-thirds of the people interesting in buying the phone are not AT&T customers.

Most vulnerable of the competition is T-Mobile, a units of Deutsche Telekom (NYSE: DT). Almost 13% of its customers expressed strong interest in the phone. DT recently expressed confidence in its US unit, which ranks fourth in the US, saying it would grow faster than the US market over the next few years. Well, maybe not.

About 8% of Sprint (NYSE: S) customers expressed interest. That would be bad news for the company which has been struggling in competition with AT&T and Verizon Wireless due to trouble integrating NexTel and poor customer service.

If the iPhone can steal anywhere the number of customers that the survey indicates, it will be a huge benefit for AT&T, which has been losing landline consumers to VoIP and needs it cell arm to help make up the revenue shortfall.

Douglas A. McIntyre is a partner at 247 Wall St.