Not a real statistic, but everyone I know in South Korea use their phones for personal banking. Especially people who aren't tech-savvy.

At first it might have been because mobile apps were easier to use than the crap they had to go through on a PC. Nowadays, though, there is no need to compare because mobile is the default choice anyway. Younger people don't even bother trying it on a PC. Older people, on the other hand, skipped the PC era altogether and went straight to smartphones. I don't think my mother has ever done any banking on a PC, but she has a bank app on her phone.