When you lose your phone, having your IMEI can be a huge help. You can potentially use it to track down your device, or simply identify a stolen one. If you lose an Android phone, you can find your IMEI online in your Google Dashboard.
Your Google Dashboard has always been a useful tool for your Google activity. Among many other things, you can also find your phone's IMEI number here. The information is stored for any device you've connected to your account, and it stays for a while, so even if it's been a while since you used it, be sure here. And don't forget all the other essential security features you should set up on your phone before you lose it.
Lost your Phone? You Can Still Retrieve its IMEI Number [Digital Inspiration]