Global telecommunication. Computer graphic of a mobile cellular telephone superimposed over a map of the world and a grid pattern,depicting global telecommunication. Battery-powered cellular telephones bypass the standard network of telephone wires,and send their signals by radio which may be relayed via satellite. On a local scale,cellular telephones link up to a grid of local radio communication centers scattered in a network of radio 'cells' | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Pasieka, Alfred |
Taille de l’image : | 4919 px × 3674 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |