Tesco Mobile has launched Xtras, a way to save money on your monthly phone bill.
Xxtras puts adverts, special offers and "content" on your smartphone's home screen every time you unlock it. As long as you're willing to put up with this, Tesco will knock £3 off your bill each month.
So what will you see? Personalised adverts, offers and other content, which you can dismiss with a swipe. Or you can click to save it or see more information.
The offers and ads will come from brands including Doritos, Branston, British Airways and News UK. This will mean you can save money on select products too.
The service went live today. It only works on Android smartphones.
It's available for monthly and SIM-only customers. You can opt in or out of the service at any time.
Tesco Mobile has partnered with mobile-based technology business Unlockd to offer the feature.
"At Tesco Mobile we're committed to offering customers great value, simplicity and choice with exceptional rewards," said Anthony Vollmer, CEO of Tesco Mobile. "Tesco Mobile Xtras, powered by Unlockd's unique mobile platform, provides our customers with the chance to make savings that really add up.
"This innovative new service is a UK exclusive and we're excited that our customers get to benefit first from this new technology."