Google Inc., owner of the world’s most popular search engine, said it’s on schedule to deliver the first mobile phones that run its Android operating system to customers by the second half of this year. Momentum for the project is building from carriers, handset makers, developers and consumers, Mountain View, California-based Google said today in an e-mailed statement. Google is developing Android — which will let users check e-mail, search the Web and watch videos on their phones — to compete with systems offered by Microsoft Corp., Apple Inc. and Research In Motion Ltd. Online advertising on phones in the U.S. may jump to $4.8 billion by 2011 from $1.6 billion this year, according to New York-based research firm EMarketer Inc. “They look at mobile as one of the emerging, multi-decade opportunities,” Scott Kessler, an analyst with Standard & Poor’s in New York, said in a Bloomberg Television interview. “This is about market share for Google right now.” Google fell $1.22 to $545.21 at 4 p.m. New York time in Nasdaq Stock Market trading. The stock has dropped 21 percent this year. The Wall Street Journal reported today that Android is experiencing delays as wireless […]