There is no official "SEID check link" provided by Apple to verify your device's security or status. If you are looking to find your SEID (Secure Element ID)—a unique identifier for the hardware security chip used for Apple Pay and NFC—you can find it directly on your device. How to Find Your SEID Number
SEID stands for Secure Element Identifier. It is a unique, factory-programmed serial number embedded into the Secure Enclave of an iPhone’s processor (the Apple A-series chip).
If you cannot access the iPhone's screen, you can check identifiers through your Apple Account: How to Find the SEID Number on iPhone 16 Pro! seid iphone check link
When you access such a link (often with the SEID appended as a parameter, e.g., https://service.example.com/check?seid=XXXXXXXX), the server returns information such as:
Apple Pay Troubleshooting: If a credit card won't activate, your bank may request the SEID to verify the secure chip. There is no official "SEID check link" provided
Crucial Point: Most third-party services asking for a "check link" actually want your UDID, not your SEID. For example, to install a beta iOS profile or sign an app, developers generate a https://... link that captures your UDID via a mobileconfig file. The SEID is rarely needed outside of NFC/payment contexts.
Some phones are blacklisted because the previous owner stopped paying their monthly cellular bill. A "Clean" IMEI ensures the phone won't suddenly stop working on your network. Verify Hardware Authenticity SEID stands for Secure Element Identifier
You can locate your SEID on any iPhone from the iPhone 6 and newer by following these steps: Open Settings: Unlock your device and tap the Settings app. Navigate to General: Scroll down and select General. Select About: Tap About at the very top of the menu.