Find My Phone It's nerve-wracking when you can't find your device. Whether it's truly lost, or just stuck between the sofa cushions, Find My Phone can help lay your worry to rest. This free service on  account.microsoft.com/devices  can ring, lock, erase, or show your Windows Phone on a map. To sign in to Find My Phone for the first time The first time you use Find My Phone, make sure you've already signed in on your phone using your  Microsoft account . Go to  account.microsoft.com/devices . If you're prompted to sign in, use the same Microsoft account you used to sign in on your phone. Choose the phone you want to find, and then click  Find My Phone . To find your phone Go to  account.microsoft.com/devices . If you're prompted to sign in, use the same Microsoft account you used to sign in on your phone. Choose the phone you want to find, and then click  Find My Phone . You'll see a map with your phone's locat...