Use an iPhone credit card swiper and turn your iPhone into a fully functioning credit card wireless terminal.
There are numerous iPhone credit card swipers: by wire, wireless, with or without a printer, chargeable Bluetooth devices or iPhone built in gadgets.
Don't forget that you do not need a swiper to accept credit cards. You can always key in transactions, same as with any online virtual terminal.
Regardless of the app or physical device you choose to use, make sure you are pleased with the payment provider that's responsible for the finance side of the transaction.
If you key in transactions you probably have an online merchant account and operating in a card not present environment. Once you swipe cards, most chances you can switch to a card present environment and benefit from CP rates and fees.