However, other mobile networks (e.g. GSM) have a constant link, therefore it is possible analyse call records and establish where TMAs are needed.
Tower of London | Eiffel Tower | Royal Canadian Mounted Police | Tower of Power | Tower Bridge | Tower Records | Tower | amplifier | Leaning Tower of Pisa | Willis Tower | Tower of Babel | Martello tower | CN Tower | Blackpool Tower | Amplifier | tower | Lieutenant of the Tower of London | John Tower | Tower Hill | St Lucian Tower | North-West Mounted Police | Bell tower | The Dark Tower (series) | The Dark Tower | Sather Tower | Lincoln Memorial Tower | tower house | Tower City Center | Tokyo Opera City Tower | The Shang Grand Tower |