| Name | Function International Payphones |
| Date | C. 1995 – 2005 |
| Manufacturer | Function International |
| Link | https://functiongroup.weebly.com/ Brochure F-800 Coin Payphone Brochure G-855 Coin Payphone |



Development of Function International
Function International was the international sales arm of the Function Group, a Taiwanese telecommunications manufacturer founded by Edward Ho in Taipei in 1979. The group established manufacturing in Taiwan in 1984, an Atlanta office in 1988, and later expanded into Hong Kong and China. Its main manufacturing operation, Function ATI, was established at Huizhou, China, in 1997. Function International itself was established in the United States around 2000, principally to serve Africa, Latin America and the Caribbean.

Function specialised in sophisticated electronic public telephones for conventional landlines and later GSM, 3G and VoIP networks. Its extensive range included coin, chip-card, magnetic-card and combined-payment models. The same basic cabinets were adapted to different networks: for example, the 800-series appeared as F-series landline, G-series GSM, S-series VoIP and W-series 3G versions.
The F-800/810/815 family featured steel vandal-resistant construction, electronic coin validation, multilingual graphical displays and remote management. The F-810 accepted chip cards while the F-815 additionally accepted magnetic cards.
The later GSM G-855, G-860 and G-865 incorporated quad-band GSM/GPRS, remote programming and even compatibility with solar-powered installations. Their RAMS-IP management system allowed operators to remotely change tariffs, download software, monitor alarms and collect call records.
Function therefore represents an interesting late generation of payphone manufacturer: rather than producing one national telephone company’s standard instrument, it offered a modular international platform adaptable to different networks, currencies and payment systems.








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