The service may be prepaid, or may take payment from a credit card or by direct debit. Some prepaid card companies allow accounts to be recharged online manually or automatically via a method called auto-top-up. Some virtual cards offer PINless Dialing, either by dialling a number unique to the customer, or by recognising the telephone number which originated the call by Caller ID and relating it to the appropriate account. Some virtual phone cards allow customers to view their call detail reports (CDRs) online by logging into their account. The virtual phonecard has become a multi-billion US dollar industry as of 2009, with a number of large corporations and smaller dot com companies. While long-distance inland calls have been offered by calling cards, by the mid-2000s conventional carriers reduced their rates to be competitive; however in many countries calling-card type indirect services can be much cheaper than normal calls. Phonecard as an artifact or collectible Telecom companies have placed advertising on phonecards, or featured celebrity portraits, artwork, or attractive photography. As the supply of any one design is limited, this has led some people to collect disposable phonecards. Due to a large number of phonecards, collectors prefer to specialize and collect cards in a certain way. Some collect phonecards that have only one specific chip type or were issued in the same country, while others prefer to get one of everything. Online clubs and catalogs provide collectors with detailed information on phonecards. In addition, these clubs include forums to assist with discussions between collectors. Support in telephones Most modern telephones, both mobile and fixed, have memory locations in which telephone numbers can be stored. Some telephones have facilities to make calls through a calling card service whose access details and PIN are also stored in the telephone's memory. This may be implemented in different ways, often by pressing one button before making a call; some telephones support "chain dialing", allowing additional numbers to be dialed when on a call (e.g., dial a PIN and a second number after connecting to an access number). So long as long enough sequences can be stored it is possible to store an access number, pause, PIN, and ultimate telephone number in a single normal phone memory location. Software applications which add calling card support are available for a small charge or free for some smartphones. See also Telephone token Prepaid mobile phone SIM card