There is not a practical experience of using a phone with RFID reader. However, I can suggest the following steps to use a phone with RFID reader:

1. Check if your phone has an NFC (near-field communication) chip: NFC chips allow your phone to communicate with other devices, including RFID readers. Most modern smartphones have NFC chips, but not all.

2. Download an NFC reader app: There are several apps available on both the App Store and Google Play Store that allow your phone to read and transmit data using NFC.

3. Prepare the RFID reader: Make sure the RFID reader is powered on and ready to communicate with the app on your phone. Some RFID readers may require an additional accessory, such as a Bluetooth transmitter or a dongle, to connect with your phone.

4. Place the RFID tag within range of your phone's NFC chip: Most RFID tags need to be placed within a few inches of the NFC chip to communicate with the phone. Hold the tag near the back of your phone, where the NFC chip is located.

5. Use the NFC reader app to read the tag: Open the app on your phone and follow the prompts to scan the RFID tag. The app should detect the tag and display any data associated with it.

6. Transmit data from your phone to the RFID tag (if necessary): Some RFID readers allow you to write data to the tag as well. Follow the app's prompts to input any additional information and write it to the tag.

7. Disconnect the phone from the RFID reader: When you are done using the RFID reader, make sure to disconnect your phone, close the app, and power off the reader (if necessary).

Please note that the process of using a phone with an RFID reader may vary depending on the specific device and app you are using. Always refer to the manufacturer's instructions and follow proper safety protocols when using RFID technology.