It has estimated that the industry makes around £70 million from the changes, with some calls costing around 50 pence a minute.
Gavin Patterson, BT's consumer managing director, said that the company has been "setting the pace" with its pricing.
He added: "We call on the rest of the industry to follow our lead. There really is no excuse for companies whose prices are either sky-high or verging on the ridiculous."
BT has also recently made changes to its prices and tariffs, with the company's Option 1 customers now given free weekend calls.
In addition, the company announced that it was increasing the cost of line rental for the first time in two years.
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