Addison Lee is introducing free, high-speed broadband - delivered via in-car 4G - to its 4,800-strong London fleet.
The new service follows a successful trial period, which saw around 150 Addison Lee cars using the 4G service.
The 4G network will offer passengers upload and download speeds of up to 12mbps. This means an episode of 'The Apprentice' can be downloaded in three minutes or if travellers are after a feature film ahead of a flight, they can be downloaded in the time it takes to travel to Heathrow from central London.
Liam Griffin, CEO of Addison Lee, said: "Addison Lee has always been the industry leader when it comes to in-car experience. The introduction of 4G continues this tradition and there are plenty more investments we will be making to deliver more best-in-class services and experiences for our customers.
"In-car 4G will help our customers be better connected than ever before, by enabling them to work and play on the move, and perhaps free up some spare time along the way. Our passengers are our number-one priority and we know this latest offering will make a real difference to their lives."
The service will be rolled out across both the VIP and Ford Galaxy fleet, and is due for completion in 2015.