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In page Payphone:

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In the Soviet period, different types of payphones were produced. There were also long-distance call payphones costing 15 kopeks, and also provided services of paid media such as listening to an anecdote, obtaining legal advice, or finding the address of the subscriber by phone number. After the collapse of the Soviet Union and the monetary reform of 1991, this form of payment became irrelevant. Some payphones were altered to accept tokens, while others have been designed to use telephone cards. For example, in St Petersburg, payment for payphones can be made with metro tokens. In some regions, calls from public phones are free of charge.[citation needed]