On Wednesday evening the company, which operates a range of popular factual channels as well as the Eurosport channels, announced that it failed to agree terms with Sky on a new carriage deal.
Last year Mr Warren and the broadcaster announced a major tie-up which will see 10 major bouts shown each year on both BT Sport and his BoxNation channel.
When BT Sport first launched it was free for all TV and broadband customers, however in 2015 the firm introduced a £5pm charge for broadband customers but offered the channels for free to those taking or renewing a TV contract.
Unlike solutions currently on the market, Call Protect works with any phone meaning every BT landline customer can opt in without buying new equipment, the firm also says it has no intention of introducing charges for the service in the future.
Based on Philipp Meyer’s acclaimed novel, the series is a described as a “multi-generational epic” which tells the story “of America’s birth as a superpower through the bloody rise and fall of one Texas family.”