Most Americans are still hesitant about banking with their cellphones and PDAs, but young people are increasingly accepting mobile banking, according to a survey. Serving the needs of tech-savvy customers will be crucial for banks to stay competitive as the collective income of baby boomers’ children is expected to surge over the next 10 years and exceed that of their parents. So far, though most major banks offer mobile banking, 89% of consumers don’t use their cellphones to conduct banking transactions, according to the study by IBM’s retail banking consulting practice. The study found that 21% of consumers ages 18-34 use their cellphones for banking transactions, compared with about 10% of the general population. These numbers, particularly for younger consumers, are expected to grow significantly.