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 from payphones. In the UK, a number of services offer reverse charge calling. A caller can dial the operator on 100 and ask for a reverse charge call, or alternatively dial an automated service such as 08000MUMDAD 08000686323, MUMDAD 686323 or 0800REVERSE 08007383773. Reverse charge calls can be made for free on some mobile networks, although the person being contacted via this service may be charged a considerable amount for accepting such a call. It is generally possible to make a collect call from a landline by dialing "0" and following automated prompts or using operator assistance. The receiving party