"+44" is the international dialing code for the United Kingdom. When making a phone call to the UK from another country, you need to use this code before the local phone number. For example, if you are calling a number in London, you would dial +44 followed by the local number, omitting the initial zero. The "+44" code is part of the global telephone numbering plan established by the International Telecommunication Union. Each country has its own unique code, which helps route calls correctly across international borders.