Numismatist noted numismatist who was not an avid collector, and King Farouk I of Egypt was an avid collector who had very little interest in numismatics. Harry Bass by comparison was a noted collector who was also a numismatist. The second group are the coin dealers. Often called professional numismatists, they authenticate or grade coins for commercial purposes. The buying and selling of coin collections by numismatists who are professional dealers advances the study of money, and expert numismatists are consulted by historians, museum curators, and archaeologists. See, for example, the International Association of Professional Numismatists (IAPN) and the British Numismatic
Collect call If the user is not in the same zone as the recipient the calls must be started by dialing 90 + carrier code + area code + the desired phone number. Similar service in Spain (900-REVERTIDO) is also planned. A collect call can be made through any mobile in Pakistan by dialing a prefix of 11 before entering in the desired number. A collect call service operates under 800 Reverse (operated by Reverse Corp Ltd), in the Republic of Ireland. It offers reverse charge calls from any fixed line phone, pay phone and most mobile phones (even if the prepaid