Pros, Cons of Mobile-Payment Systems

Wireless? Bar codes? What's the best way to pay with your phone? Apple Pay, Google Wallet and a few other services use a wireless technology called near-field communication, or NFC. With Apple Pay, the phone unlocks automatically when you hold it near the NFC reader on the merchant's payment system. You're then prompted to scan your fingerprint to authorize the transaction. Google Wallet isn't quite as fast, as it requires a passcode.

Some big merchants including Wal-Mart, CVS and Rite Aid are developing their own systems based on bar codes. Some have even disabled their NFC equipment in the meantime. Their system, CurrentC, is expected to debut next year. For now, bar-code payments tend to be made through apps for specific stores, such as Starbucks.

NFC transactions tend to be faster to complete but it takes time to get used to how to hold your phone in relation to the reader. With bar codes, you need several maneuvers to get to the right section of an app, but the practice of scanning a bar code is more familiar to people.

Here's a look at various mobile-payment options:

APPLE PAY

This NFC system from Apple Inc. has gotten the bulk of the attention -- and for good reason. It's easy to set up and use, and it works with a variety of credit and debit cards. Beyond paying at stores, you can use Apple Pay to make online purchases within apps without having to re-enter your billing and shipping information.

Pros: It's secure because your number isn't stored anywhere. It uses a substitute number that hackers won't be able to do anything with unless they also have your phone and your fingerprint.

Cons: Some cards don't work yet. And you have to pony up for the latest Apple device: In-store payments require an iPhone 6 or 6 Plus....

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