The function of scanning RFID chips by mobile phones is usually implemented through NFC (Near Field Communication) technology. Although NFC and RFID technologies are different, NFC is compatible with certain types of RFID tags (usually high-frequency 13.56 MHz tags). Here are the general steps for scanning an RFID chip with your phone:

1. Confirm whether the phone supports NFC
First, you need to confirm whether your phone supports NFC function. Most modern smartphones, especially mid- to high-end models, have NFC capabilities built into them. You can check this in your phone’s settings:

Android phone: Go to "Settings", search for "NFC", and confirm whether the NFC function is turned on.
iPhone: iPhone 7 and above models support NFC. iPhone Xs and above models can directly read NFC tags.
2. Install related applications
In order to better read and manage RFID/NFC tag information, you may need to install an application that supports NFC reading. Here are some common NFC reading applications:

NFC Tools (Android and iOS)
NFC TagInfo (Android and iOS)
Trigger (Android only)
TagMo (Android only)

3. Enable NFC function
Make sure your phone’s NFC function is turned on:

Android phone: Go to "Settings" > "Connect Devices" or "Wireless & Networks" and turn on the "NFC" switch.
iPhone: For iPhone 7 to iPhone
4. Scan the RFID/NFC tag
Place the NFC antenna area of ​​your phone close to the RFID/NFC tag. The NFC antenna is usually located in the center area on the back of the phone (the exact location varies by model). Keep the distance between the phone and the tag within a few centimeters, and the system or app will automatically read the tag information.

5. View and use label information
After successfully reading the tag, the app displays the tag information. You can view, edit, or perform corresponding operations on the label information as needed. For example, the NFC Tools app can read, write and manage tag data.
Precautions
Tag type: Make sure you are using an NFC-compatible high-frequency RFID tag (usually 13.56 MHz). Low-frequency or ultra-high-frequency tags (such as 125 kHz or 915 MHz) cannot be read by mobile phone NFC functions.
App permissions: Make sure the app has the necessary permissions to access NFC functionality. If the app cannot read the tag, check the permission settings.
Distance and location: When reading the tag, make sure there is no interference from metal objects between the phone and the tag, and stay within an effective distance.
Through these steps, you can use the NFC function of your phone to scan and read compatible RFID tags for convenient data management and application.