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You're in the store trying on a stunning but outrageously priced shirt. You have to have it, and your hand has already palmed your debit card -- but wait! Did your mortgage payment clear your money market account yet?

You could whip out your smartphone and check your balance using your bank's app, and maybe make a quick transfer between accounts. If you access your bank account information on your mobile phone, are you jeopardizing the security of your checking and savings accounts?

No, says Phil Blank, the managing director of security, risk and fraud at Javelin Strategy and Research -- not as long as you exercise some basic online street smarts.

"All you need to do is use a little common sense," Blank says.

Consumers worried about mobile banking security

If you think twice before accessing banking information on your smartphone, you're not alone. Even though smartphone use has jumped, more consumers with mobile banking capabilities are concerned that sharing personal financial information on their phones will open them up to hacking and fraudulent activity.

According to a 2010 Javelin survey, about 40% of smartphone owners said mobile banking made them nervous -- up dramatically from 26% in 2009.

"It's very clear to us that people are saying, 'I am nervous about using my smartphone to bank,'" Blank says.

In Blank's estimation, financial institutions must address this perception quickly. Otherwise, many consumers will never take advantage of mobile banking.

Banks: We've made mobile banking safe

Marc Warshawsky, senior vice president of mobile channel planning and design at Bank of America, says its customers have no reason to worry about their financial information being stolen -- whether they're using a computer or smartphone to bank.

"We've taken the necessary steps to minimize any risk to their accounts, whether they access them on their mobile phone or from their computers," he says.

Besides, Warshawsky says, should something happen and their phones are hacked, customers of Bank of America would be protected by its zero-liability guarantee. "They would not be responsible for any unauthorized charges to their debit cards, credit cards or accounts," he says.

Smart banking on your smartphone

If you're still unsure, here's what Blank and Warshawsky say you need to do to be sure the transactions you make using a smartphone are safe:

Do . . .

  • Stick to your bank's apps for mobile banking or to trusted, well-reviewed third-party personal finance apps. Download them directly from the app store for your phone's type -- iPhone, Android, etc.
  • Treat your smartphone as if it's a PC. "I really hate the term 'smartphone,'" Blank says, "because what it really is is a PC that happens to make phone calls. If you look at your phone that way, you're minimizing your risks." For instance, install antivirus software on your phone as you would on your PC.
  • Monitor the whereabouts of your phone. One big difference between your smartphone and your desktop computer is that the latter is much less likely to fall out of your pocket or purse. Check every so often to make sure your smartphone is on you when you're out and about.

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Don't . . .

  • Use public Wi-Fi access to conduct your banking business. You can't be sure it's secure, Blank says. Opt for wireless networks that require a network security key or have some other form of security.
  • Be the first in line to use your bank's new app. "Wait until it's been about 30 to 40 days and then go and download it," Blank advises. The reason? Sometimes early versions of apps contain malware or are not safe.
  • Leave the keys in plain sight. Never send a text message on your phone containing sensitive information such as your Social Security number, checking or savings account number, or your account passwords. "We don't give the customer the option to store anything sensitive on their phones," Warshawsky says. "That's for their own protection."
  • Be fooled by emails or text messages asking for personal information. Often, these "phishing" messages claim to be from your bank and ask for personal information or ask you to click on provided links to update account information. "We would never ask you to provide your ID or password over digital communications," Warshawsky says. You should also avoid visiting any websites that you don't know anything about.

Using your phone to bank on the go can be a great convenience. As long as you're smart about it, says Blank, there's no reason you shouldn't access your bank accounts through your smartphone.

This article was reported by Beth Orenstein for MoneyRates.com.