'Most Londoners don't want wifi on the Underground' The study, carried out by discounts site My Voucher Codes, which polled 950 Londoners aged 18 and over, also found that 31 per cent of those against the idea were so, because they thought it would lead to an increase in thefts on the tube - especially if people had their laptops and tablet computers on show at all times. A further 14% of the respondents who were not in favour of wifi on the tube, explained that they thought that people spending their whole journey using the internet would lead to "increased stress" whilst travelling. The remaining 7% were concerned about the amount of space that would be taken up by people using their laptops. Initially wifi on London Underground will be free.