The Advertising Standards Authority (ASA) has reprimanded Sky over one of its broadband adverts.
BT complained to the ASA that the Sky advert was misleading customers by informing them they could save £185 on broadband and phone calls by switching to its service.
In the broadband advertisement, Sky compared its 8Mb package bundle with BT's Total Broadband Option 2.
According to BT, the Sky advert was misleading as it failed to mention a number of facets of its broadband package which had significant value to consumers, such as free Wi-Fi minutes and the "superior" broadband router it supplied.
The ASA said: "We noted the factors of BT's compared product that Sky had already included on the website referred to in the ad and considered that the permanent security package BT offered was an additional factor that should have been drawn to consumers' attention.
"Because not all significant information was highlighted either in the ad or by other means, we concluded that the comparison was likely to mislead."
The ASA recently found TalkTalk guilty of breaching advertising codes over claims made in its broadband advertising.