That's according to the latest visualisations from U.S artist Nickolay Lamm.
Lamm worked with computer engineering professors in Illinois to learn how mobile networks and frequencies are distributed across U.S cities such as New York and Chicago.
The result is a colourful grid system that blankets buildings and famous landmarks, and in real-life would change and glow as the frequencies changed.
To plot the signals, Lamm consulted with Professor Danilo Erricolo, from the University of Illinois at Chicago and Professor Fran Harackiewicz, from Southern Illinois University Carbondaleegular.
Lamm began by dividing each city into a hexagonal grid, and the grid points were based on the location of mobile phone masts and base stations.
Lamm then used network operator data to work out which frequencies are emitted from which individual stations.
Each frequency was assigned a colour, and the higher the number of users in that location, using that frequency, the larger the block of colour. Where multiple signals were sent, the colours were combined.
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The channel combinations shown are not static, but rather change rapidly in time as different users are assigned different channels,' explained Lamm.
'If you were to take a photo of these rapid changes, you'd likely see a wide array of colours as seen in the illustration.'
In the city centres, Lamm deliberately made the hexagons smaller to account for the increased number of residents, and therefore the increased number of signals and frequencies need to serve them.
Comment: How appropriate, Capitol Hill beaming out those mind altering signals
Lamm's other images show how the signals would look if users were stood in front of Capitol Hill or the Herbert C Hoover building in Washington.
The project was a follow-up to Lamm's Wi-fi visualisations released last year which depicted the shape of the Wi-Fi signals. Different colours were used to distinguish the different sub channels.
In these images, Lamm worked with former Nasa astrobiologist M. Browning Vogel to learn how the networks move.
The designs were then based on coverage data taken from around the U.S Congress and The National Mall in Washington.
Each picture shows a familiar Washington landmark surrounded by Wi-Fi channels represented as different colours, as 'interlocking bubbles'.
Lamm then added a hazy effect to areas of the signal broken by a tree, landmark or other obstacle.
looks familar... perhaps it's just another one of those Serial Experiments like in LAIN?