Which advert used I wish I was clever like you Brian?

The phrase "I wish I was clever like you, Brian" is from a well-known advertisement for the UK-based mobile network provider, O2. This line became popular in a campaign featuring a character named Brian, who was portrayed as someone who made clever decisions, contrasting with others who did not. The ad aimed to promote the idea of smart choices in mobile plans and services. The catchy tagline resonated with viewers, contributing to the campaign's success.