One of Tesco's internal mantras is 'follow the customer'. This means stocking the goods and services that consumers most want at the time they want it. As part of this philosophy the food retailer is sizing up the telecoms sector. Mobile phones were a steal when the main operators were trying desperately to win market share. Now prices have rocketed and demand has slackened. Tesco believes the environment could present an ideal muscling-in opportunity. The telecoms industry is highly regulated, which creates difficulties, but Tesco could either buy airtime from a mainstream operator or undertake a joint venture, much as it did with RBS.