There can be several reasons for mobile telephone failure. A user may fail to charge their device's battery, or the battery may have lost its ability to hold a charge. A user may also have forgotten their access password or PIN and may no longer be able to use their device. Devices can also become locked if several incorrect access codes are entered by a user. If a phone is not handled with care, it may become damaged when dropped, for example. In all of these instances, the corresponding user will be unreachable and unable to contact others using their mobile phone.