Virgin has begun charging for the Wi-Fi service on London Underground, initially rolled out for the London 2012 Olympic Games.
The service will cost £2 for a day pass, £5 for a weekly pass and £15 for a monthly pass, though a number of mobile carriers have secured deals to keep the service free for their customers.
Virgin is also offering early adopters a special deal, confirming that throughout February users will get three months' access for the price of one.
The company has confirmed the service will remain free for Virgin Media, Vodafone, EE, T-Mobile and Orange customers. However, customers on Three and O2 networks will be charged.
The Wi-Fi service is currently active in in 92 London Underground stations, though Virgin plans to extend the service to a further 11 Tube stations, which are due to come online later this week. These include Gloucester Road, Kentish Town and Redbridge.
The Wi-Fi service was initially rolled out in the lead-up to the London 2012 Olympic Games.
The service proved popular during the period with Virgin Media reporting that over eight million Wi-Fi connections were delivered on its London Underground network during the Olympic Games, from a total of 443,000 users in August 2012.