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Whenitcomestonetworkphonenumbers,therearevariousprefixesthatcanbeuseddependingonthecountryorregion.IntheUnitedStates,forexample,phonenumberscanstartwiththefollowingprefixes:201,202,203,204,205,206,andsoon.Eachprefixcorrespondstoaspecificgeographicalareaorserviceprovider.IntheUnitedKingdom,phonenumberscanstartwithprefixessuchas020,021,022,023,024,andsoon.Theseprefixesareusedtoidentifythelocationofthephonenumberorthetypeofserviceitisassociatedwith.Othercountriesmayhavedifferentprefixesfortheirnetworkphonenumbers,soitisimportanttofamiliarizeyourselfwiththespecificprefixesusedinthecountryyouareinorcalling.Understandingtheseprefixescanhelpyouidentifywhereacalliscomingfromordeterminethetypeofserviceassociatedwithaparticularphonenumber.