Caller Services refer to a range of features provided by telephone companies to enhance the experience of making and receiving calls. These services can include options like caller ID, which displays the name and number of incoming callers, and call waiting, which alerts users to incoming calls while they are already on a call. Additionally, Caller Services may offer voicemail, allowing callers to leave messages when the recipient is unavailable. Other features can include call forwarding, which redirects calls to another number, and do not disturb, which silences incoming calls during specified times.