More than a third of UK current account holders will be able to use Zapp to pay directly from their accounts without cash or card.
The multinational bank confirms attack, saying it "did not affect any customer data, but did prevent customers using HSBC online services."
HSBC banking appears to be offline, at cash points, over the phone, in shops and online.
Such a move to replace the BlackBerry--still in the mulling stages--could see the Apple gadget "potentially be deployed, conservatively, to 200,000 people."
Customers of HSBC, Bank of America, and Washington Mutual suffer highest rates of identity theft in the banking industry, according to report by a UC Berkeley Law School researcher.
With just a phone number, customers of banks including Barclays, HSBC and Lloyds could send money from their phone by 2014.
Seven companies affected, including HSBC, Cathay Pacific Airways and the Hong Kong Stock Exchange.
Google, Liberty Global, and HSBC, are working to build a satellite system to help bring Internet access to those lacking first-world network infrastructure.
The FBI investigates a data breach into one of the world's largest banks that may have involved malware being deposited on an employee's personal computer.