BT customers will soon have to pay up to 10% more for phone calls on their landline.
The telecoms giant, which has 12.5 million phone customers, said it would also increase its monthly line rental by 50p from the beginning of October.
The cost of connecting a call will go up from 9.9p to 10.9p, while the daytime rate rises from 5.9p to 6.4p.
BT said it estimated the impact of the changes would amount to 1p a day because its average customer makes only 80 seconds of daytime calls each day and more than half subscribe to inclusive packages.
Customers could also save money by signing up to 12-month line rental contracts upfront, according to the company.
The firm warned customers that from October, they will have to pay a landline rental charge of £13.29 a month, or £12.04 if they receive their bills by e-mail.
After October 1, the standard cost of a landline will be £159.48 - or £131.88 for people who pay the full sum upfront.
A BT spokesman said It was necessary for the company to review prices to cover costs and emerge from recession in "good shape".