Obopay, provider of a service allowing people to make easy payments over their mobile phones, is looking to raise $25.3 million in options, warrants and securities, according to a filing with the SEC. Based in Redwood City, Calif., the company has raised more than $150 million to date and is backed by Qualcomm, AllianceBernstein, Citigroup, Redpoint Ventures, Societe Generale, Richmond Management, Essar Communications Holdings, Onset Ventures, Olayan, Promethean and Nokia.