Lehman Brothers upgraded mobile phone maker Motorola Inc ( MOT ) to overweight from equal weight, saying improvements in operating expenses should help the company's phone unit return close to break-even by the fourth quarter. Operating expenses are important but so are compelling products and Motorola is lacking in buzz at the moment. Motorola does not have anything close to the iPhone, for example, and the RAZR, while still a good seller, does not have the cachet it once had. If buzz isn't the strategy, then heading in the opposite direction and dominating the low-cost market sector is a viable alternative. Motorola has not been especially successful in this area either, having admitted it can't match competitors prices. To make matters worse, Sony-Ericsson is now entering this market and that will only make the sector more competitive and more difficult for Motorola. Given that growth is so strong in emerging markets where high-end devices are not necessarily in highest ...