Moody's and Standard & Poors both put SoftBank's credit rating under review for a possible downgrade, saying it would heap pressure on an already debt-heavy balance sheet. The agreement catapults SoftBank, little known outside Japan, to third spot globally among cellular firms after China Mobile and Verizon. While the deal has raised eyebrows among some analysts and investors, Credit Suisse analyst Hitoshi Hayakawa said it may prove to be an astute move. "This has the potential to transform the SoftBank Group into a behemoth straddling Japan, the US, and Asia," he told Dow Jones Newswires. "This opening for industry realignment on a historic scale presents a excellent opportunity to invest."