Mobile shopping is becoming an everyday activity for a significant number of consumers, new data shows, with 2.5m Brits -- 5% of adults -- saying they buy on mobile at least daily. Among 18- to-34-year-olds, the proportion buying on mobile every day was twice as high, at 10%. The findings are from a UK-wide ICM study of 2,000 people, released as part of a new report from Criteo.