Why you could be wasting £144 a year on your mobile bill as ‘challenger’ networks outshine major providers in new survey

MILLIONS of mobile users are being urged to ditch the "big four" networks after a new survey revealed customers are paying a premium for sub-par service. According to a massive study of more than 5,000 users by watchdog Which?, smaller "challenger" brands are consistently thrashing household names like O2, EE, Three, and Vodafone when it...