Largest telephone conference call

According to Official Guinness Records,

The largest telephone conference call included 16,972 participants in an event organised by Broadnet Teleservices (USA), in Highlands Ranch, Colorado, USA, on 12 December 2012.
All the participants were on the call concurrently for at least 10 seconds. The original number of participants was higher but had to be reduced after a second electronic check was carried out.

For a complete list of 2012 records, please visit 2012 Guinness Records in United States.

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