Look at the 4th, 5th, 6th, and 7th digits of the S/N.

For those who want the activation data directly from Xiaomi’s servers without using IMEI warranty pages, here is a power-user method using an API endpoint.

If you still have the original box, the sticker on the back will show the date of manufacture. While not the exact activation date, it helps determine if the phone was sitting in storage for a long time, as advised. Important Tips Regarding Activation Dates

Open your phone's dialer and type *#06# . Your IMEI1 and IMEI2 (and often the Serial Number) will appear on the screen.

For a technical "calibration" date, which is typically the date the hardware was finalized (very close to activation/manufacturing), you can use a hidden menu: How To Check Xiaomi Phone Activation Date

Many people mistakenly believe a factory reset will erase the activation date. The activation date is stored on Xiaomi's secure servers linked to your device's IMEI and CPU ID. Even after a full wipe, the "first boot" timestamp remains unchanged.

A system overlay will instantly appear, revealing your , IMEI 2 , and Serial Number (S/N) . Take a screenshot or copy these digits down. Method B: HyperOS / MIUI System Settings Open the system Settings menu. Tap the About Phone card located at the top of the menu.

If you signed in with a Google account immediately upon starting your phone, Google records the first sign-in date, which is usually identical to the activation date. Open a browser and go to google.com. Find Your Xiaomi: Click on your Xiaomi phone.