A BT advert has been banned by the Advertising Standards Authority (ASA) for making claims likely to mislead consumers.
The regulator upheld two complaints brought by members of the public over a promotion for BT's broadband packages.
In the advert, BT claimed that its Home Hub routers offer the UK's most reliable wireless broadband connection.
However, the ASA said the broadband provider had failed to prove this was actually the case.
"The ad did not contain a qualification to make clear that the 'invisible network of competing signals' referred to signals emitted from non-Wi-Fi devices," the regulator said.
Nor did BT make clear that the claim 'The UK's most reliable wireless connection' referred to their Home Hub 3 router only, it added.
The ASA also criticised BT over its claim that the routers are designed to avoid interference, and the insinuation that this factor makes its routers most appealing to consumers.
"We considered that most viewers would not know that all routers avoided interference from Wi-Fi devices," the regulator added.