Apple wants iPhone users and potential customers to know that there is an app for just about everything that you might want to do. That is true, I have yet to want an app for something and not be able to find one. If what you are wanting is to turn your iPhone into a near field communications or RFID reader there is an app (and a hardware accessory) for that too.
The new Wireless Dynamics iCarte accessory plugs into the charge and sync port of the iPhone and allows the device to read RFID and NFC. A smart chip embedded in the device allows the iPhone to become an electronic wallet to support contactless payments.
The accessory can also transmit the NFC or RFID data to enterprise databases in real-time over WiFi or 3G connections. The iCarte operates at 13.56MHz and supports ISO14443A/B and ISO15693 tags including NXP MIFARE and I-CODE SLI. The device works with the iPhone 3G and 3GS running OS 3.0 or higher. The iCarte also as a miniUSB port built-in that allows the iPhone to charge without unplugging the reader.