We are never privy to how they implement security. So always trust only with utmost caution. May be even avoid it as much as possible.
from The Wall Street Journal
Citigroup told its U.S. mobile banking customers they should upgrade to a new application designed for Apple's iPhone after the bank's original version was found to have a security flaw.
Citi said its iPhone app accidentally saved personal account information in a hidden file on users' iPhones. Information that may have been stored includes account numbers, bill payments and security access codes.
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