| Name | Sovereign Card Payphone |
| Date | early 1990s |
| Manufacturer | Schlumberger |
| Usage | Supervised |
| Further notes |
| SC1- Sovereign Card Payphone The Sovereign Card Payphone (SC1) was introduced by British Telecom in the early 1990s as a wall-mounted, card-only public payphone designed to accept BT optical Phonecards. Manufactured by Schlumberger, the SC1 eliminated the need for coin handling, making it particularly well-suited to high-traffic or vandalism-prone environments where theft and maintenance were concerns. The payphone featured a digital display that showed the remaining units on the inserted card and allowed users to make local, national, international, and operator-assisted calls. It was built with a focus on simplicity, reliability, and security, offering a tamper-resistant design and a user-friendly interface. Over time, the SC1 was superseded by more advanced models such as the Sovereign Multi-Pay (SM1), which supported a wider range of payment options including coins and chip-based cards. As optical Phonecards were phased out and public payphone demand declined, the SC1 was eventually withdrawn from service. |
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