TalkTalk has become the first UK service provider to make all landline privacy calling features available free of charge.
Last Caller Barring and Anonymous Caller Reject services are now accessible to all four million TalkTalk phone users at no additional cost.
These are in addition to the firm's Caller Display, Withhold Number and 1571 voicemail services, which were already available for free.
Other telecoms providers charge for Last Caller Barring and Anonymous Caller Reject features, costing consumers up to £3.70 and £4.50 per month respectively.
TalkTalk Chief Executive Dido Harding said that nuisance and unwanted calls are "a huge source of stress and frustration" for phone users.
"We don't believe that people should be charged for the privilege of protecting their privacy," she stated.
"Our customers can now benefit from even more free features to help them avoid nuisance calls, helping to make TalkTalk homes even better off.”
Marie-Louise Abretti, telecoms expert at uSwitch.com, welcomed the announcement, noting that nuisance calls and scams "remain a huge problem" for British consumers.
Citing uSwitch research, she noted that eight per cent of people never answer their landlines because they are worried it will be a sales call.
Another 29 per cent only answer if they are aware someone they know is trying to get in touch.
"It is unacceptable that people are left feeling trapped in this way, therefore any attempt to help shield consumers from nuisance calls is extremely welcome," Ms Abretti stated.
She commented that TalkTalk's decision to make its range of privacy services freely available is "great news" for all customers.
"It’s particularly welcome as those who rely most heavily on their landlines are often those who require the most protection, but can least afford to pay for it," Ms Abretti added.
She expressed hope that other providers now follow TalkTalk’s lead and start to protect their customers from nuisance calls free of charge.