Starting from version 2.22, on both iOS and Android mobile app, we start to push login notifications to your mobile app. If your account is logged in from another place, you will receive a push notification, with message like following:
“Your account was logged in from samsung(SM-G930U). Please make sure it was you.”
Sometimes, you may see “Unknown device” in the description. This is actually login from PC client. We will update the description in a future update.