Notspots are areas where cellular coverage is poor or non-existent. There are many synonyms for notspot, including dead zone, signal shadow, carrier gap, wireless gap, and cellular black hole. A dead zone refers to a geographic area where cellular coverage is completely missing, while a signal shadow denotes an area where coverage is poor due to obstacles such as buildings or hills. A carrier gap refers to an area where a specific cellular provider has no coverage. A wireless gap and cellular black hole both refer to areas where coverage is weak or missing altogether. All of these terms are used to describe the frustrating experience of being in an area without cell service.