[lmm]

Huh? I know my bank balance (it's right there on my phone) much more easily than counting up how much cash is in my wallet.

[throwaway422432]

I don't do banking on my phone, and non-US currency where you can see what you have from the colour of the visible portion of the notes without opening the wallet.

Also unlike a phone I won't get fined for looking at my wallet while stopped at the lights.