Abstract: A mobile telephone (1) includes associated with a processor (18) a reminder controller (22). A reminder can be entered either using the phone (1) or using a remote terminal, such as a PC or another phone. Each reminder is associated with an event being the start of a particular application, or an event being an identifier in a software application becoming a preset value. For example, a reminder may be entered to thank a friend or family member for a birthday card the next time that a call handler application (31) is commenced and it is determined that a call is being made to or received from that person. The phone (1) operates to detect an application start event, following which it is determined whether a parameter associated with the reminder matches a parameter associated with the application (for example, the outgoing phone number, or CLI), and announces the reminder as appropriate.