TalkTalk customers can now access their accounts over the telephone by using their voice to prove their identity.
The company is the first telecoms provider to use voice biometric technology for this purpose, although this is common in the banking sector.
It means that four million people will no longer have to provide personal details to demonstrate they are who they say they are.
Furthermore, the TalkSafe technology should reduce the amount of time customers spend on a call, while they will not be expected to repeat their details if they are transferred to another customer service advisor.
The move is part of a wider effort to enhance the customer experience and ensure their personal data is as secure as possible.
Tristia Harrison, Consumer Managing Director at TalkTalk, commented: "We’ve listened to what our customers have told us about wanting a simple, secure service. TalkSafe is an important and exciting step on that journey.”
"As the first UK telecoms provider to roll out voice biometrics as standard, we’re proud to be leading the way in making this advanced technology accessible to millions of homes across the country at no extra cost."
The next time a customer rings TalkTalk, they will still have to go through the current verification process and then be given the option set up TalkTalk safe.
This involves repeating a simple phrase three times so they can create a voice print. TalkTalk believes that since every person's voice is unique, voice biometric technology is one of the most secure forms of identification available.