The number 0900-78601 was a dodgy premium-rate telephone line directed at children. Adverts for the Telefun number used to appear on Pakistani television and calls to the line would be charged at between 12 and 15 rupees per minute. In return the child could hear jingles and songs and maybe jokes.
This 0900 78601 scam would be familiar to all Pakistanis who grew up in the country in the 2000s.