Stewart led the first backbench motion for expanding broadband and mobile coverage, securing what was then the largest number of cross-party endorsements for a backbench motion. In a report published in 2011, Stewart won support from the House of Commons Culture, Media and Sport Committee in calling for mobile phone companies to be forced to provide coverage to 98% of the population, and in 2012, his campaign achieved its goal when regulator Ofcom announced its plans for the auction of fourth generation (4G) bandwidth for mobile phone services. In March 2018, Ofcom announced that the 98% target had been met.