Premium-rate telephone numbers are telephone numbers that charge callers higher price rates for select services, including information and entertainment. A portion of the call fees is paid to the service provider, allowing premium calls to be an additional source of revenue for businesses. Tech support, psychic hotlines, and adult chat lines (e.g. dating and phone sex) are among the most popular kinds of premium-rate phone services. Other services include directory enquiries, weather forecasts, competitions and ratings televoting (especially relating to television shows). Diplomatic services, such as the US Embassy in London or the UK Embassy in Washington, have also charged premium rates for calls from the general public. Premium calls are typically routed like toll-free numbers, and service providers can be located independent of the area code. These telephone numbers are usually allocated based on a national telephone numbering plan that makes them easily distinguishable from non-premium numbers; telephone companies often offer their customers the option to block calls from these number ranges, and in some jurisdictions, are required by law to offer blocking services. Computer criminals have used premium-rate numbers to defraud unsuspecting Internet users. One scheme involved inducing users to download a program known as a dialer that surreptitiously dialed a premium-rate number, accumulating charges on the user's phone bill without their knowledge. Another now-uncommon premium-rate scam involves television programming that induces young children to dial the number, banking on the notion that they will be unaware of the charges that will be incurred. One variant, targeted at children too young to dial a number, enticed children to hold the phone up to the television set while the DTMF tones of the number were played. This type of scam was especially popular in the late 1980s to early 1990s in the United States before tougher regulations on the 900 number business forced many of these businesses to close. Africa Egypt In Egypt, premium rate numbers begin with the prefix 0900, and for mobile services it uses short numbers to call or to send SMS to(4 digits only). South Africa In South Africa, premium rate SMS short codes are four or five digits long, starting with either '3' or '4'. Premium rate telephone services are regulated by The Independent Communications Authority of South Africa (ICASA) Asia Armenia In Armenia, premium numbers start with 900, followed by six digits. Indonesia In Indonesia, premium numbers begin with 0809 and are marketed