The group has increased its Line Rental Saver Plan, which allows customers a better deal by paying a year advance, from £129 to £141 from June 1.
BT denied the move was linked to its push into sports broadcasting, which is seeing the firm muscle in on Sky's dominance of sport after winning a three-year deal to show 38 Premier League games a season.
The group said: "Line Rental Saver continues to offer a generous discount of 23% on the price of our standard line rental, saving customers £44 a year."
"This increase, which is the first for 14 months, does not affect existing Line Rental Saver customers. Customers who take standard line rental from BT will benefit from our price freeze until 2014" it added.
A spokeswoman stressed there was "no link whatsoever between these price changes and our investment in sports rights".
BT said last month it would offer BT Sport for free to broadband customers as it goes head to head with Sky.
The group also announced a host of big names to front its coverage. Manchester United defender Rio Ferdinand has been signed up by BT as a football expert, joining Tottenham's Gareth Bale and Arsenal's Alex Oxlade-Chamberlain.
Double Champions League winners Owen Hargreaves and Steve McManaman and former England goalkeeper David James have also been signed up as football experts to its sports channels, which will be called BT Sport 1, BT Sport 2 and ESPN. Commentators will include former England striker Michael Owen, Ian Darke and Darren Fletcher.