Good luck with allowing your financial data on your phone be open & available in a public setting.
Good grief....
What part of the Apple iPhone is secure did you fail to grasp? It is not the sieve that an Android phone is. The data on an iPhone is end-to-end encrypted to a 256 bit AES standard, which is far better than the 128 bit AES standard that most financial institutions in the US and Internationally use. . . and even messaging on an iPhone is encrypted to that standard.
If an iPhone is stolen, the thief will require either YOUR finger or YOUR face or YOUR unique passcode to unlock it and access YOUR encrypted data. . . and while he's trying to figure those out, you can brick it from any computer in minutes, either locking it down so that only your unique AppleID is required to unlock it, or even erase it so that it can never be restored to working condition without your AppleID and passcode. . . and even Apple cannot do it, because Apple does not have your passcode.
When Apple added these protections in 2014 to the iPhone 5s model with the Secure Enclave, the iPhone went from the single most stolen item in strong arm robberies snatch and grab thefts, and purse snatchings in New York City and other major cities to almost nothing within a few months. . . because iPhones simply could not be sold for any value to any fence. Petty criminals went on to more salable items to steal in such crimes. In fact, the overall crime rates in those cities dropped by a significant percentage after Apple increased the security on their phones.