If the device exceeds a certain temperature threshold, it will present a temperature warning screen similar to this: An iPhone showing this message might still be able to make emergency calls. To resume use of your device as quickly as possible, turn it off, move it to a cooler environment, and allow it to cool down.
A lien on property is a type of security interest placed on a piece of property, real or personal, in order to secure a debt or obligation. While the underlying legal theories are different, in a practical sense, a lien is similar to a mortgage, in that the property that is the subject of the lien is taken and sold by the creditor to satisfy the debt of the property owner.
Any lien is an encumbrance, but not all encumbrances are liens. Liens always represent a monetary interest. Encumbrances are not necessarily monetary, but they also include property use restrictions or easements. Encumbrances can be any interest in the property of another person that burdens or reduces the property's value or clear title.