'Round here (Hong Kong), coverage in tube (MTR) tunnels and road tunnels has been available for years. SOP is to talk at a volume that renders telecommunications unnecessary. The other effect is to allow phone companies to increase their prices... there is a non-optional monthly "tunnel surcharge", about 20% of my bill, even for a phone that never leaves my office.
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How backward can you get?
'Round here (Hong Kong), coverage in tube (MTR) tunnels and road tunnels has been available for years. SOP is to talk at a volume that renders telecommunications unnecessary. The other effect is to allow phone companies to increase their prices... there is a non-optional monthly "tunnel surcharge", about 20% of my bill, even for a phone that never leaves my office.
Mine's the one with the earplugs.