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WASHINGTON, DC (WUSA) -- Maryssa Menkin pays for her food using Square Wallet's free application.

The digital wallet app links to her credit card, which she finds very convenient.

"I hate carrying a lot of things and, you know, I find that I do always have my phone on me. So, it's just very simple," Maryssa says.

Starbucks is one of hundreds of thousands of businesses nationwide that have signed up for Square Wallet.

It is compatible with a number of iPhone and Android models. And, it's pretty easy to use. But other digital wallets are not as widely accessible.

"For instance, Google Wallet and Isis aren't available on iPhones and only work with some service providers. They also require wireless technology that only some stores can use," saysConsumer Reports Amanda Walker.

Some digital wallet apps only link with a few credit cards. So, you may need to link to a prepaid card, but that can incur additional fees.

It may also mean you don't have the best protections if you lose your phone or someone breaks into your account.

Walker says, "Prepaid cards, whether in your hand or on your phone, have no guaranteed protections against unauthorized transactions, so you could lose whatever balance is on the card."

But, if you're like Maryssa and want to leave your bulky wallet at home,Consumer Reports says use an app like Square Wallet that links to a credit card for the best consumer protections.

Hidden Costs In Cell Phone And Digital Wallet Payments

Remember if you lose your phone, be sure to report it or any suspicious activity to the credit card company right away. And, inform your cellular carrier so it can disable the phone.

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