"Mizter T" wrote in message
...

On Mar 15, 3:54 pm, joelpk wrote:
Thanks to all

Will the cellphones work in the underground stations and on the tube?

Not on the London Underground/ Tube i.e. the Piccadilly Line, no -
unless mobile coverage has been installed recently at the Heathrow
tube stations which I'm not aware of. (Note that a good stretch of the
Piccadilly line into central London is above ground - specifically
from Hounslow West to Barons Court - so you'd be able to get mobile
coverage there.)

When T5 first opened and there was a lot of changing of the allocation of
flights terminals, posters appeared on the Piccadilly Line trains mentioning
that the train would be above ground, and with mobile coverage, for around
23 minutes on its way to Heathrow. This was for the benefit of anybody who
needed to phone their airline to check which terminal they needed.

Mobile phone coverage is however available throughout the Heathrow
Express/ Heathrow Connect stations and tunnels - i.e. the route of the
'free transfer train' between the terminals. (Do note that this is
only free to use between the various Heathrow terminals!)

....and for the original poster, arriving at terminal 4, Heathrow Connect is
the one you want.

Martin