"swiping" your phone is still new technology, Google is the only ones i know of working on an app like that. (Google Wallet) but currently uncompatible with the One S, and it only works if you have a Mastercard, not a visa. but we should see this advance soon as long as Google is able to keep the info very secure.
The phone needs to have special hardware called NFC (Near Field Communication) to be able to talk to the scanners. This is built into the HTC One X, but not the One S. So even if Android ends up supporting it, this phone can't use it.
I'm sure you've already cheosen an app to accept credit cards with. However, just in case you didn't please check out our app, PhoneSwipe. I'ts a great app and we have excellent customer service. Let me know if you have any questions.