The America code is 1. In order to get the party you wish, the number is 1+specific area code+phone number.
There is no area code 338 in North America (USA, Canada, etc.).
There is no area code +1 851 in North America.
There is no area code 483 in North America (USA, Canada, etc.). International country code +48 is Poland.
According to NANPA, area code 748 is currently unassigned. It is not a valid area code.
There is no area code +1 637 in North America. Country code +63 is the Philippines.
Area code 558 is unassigned in North America (USA, Canada, etc.). International country code +55 is Brazil.
Telephone country code +1 is North America (USA, Canada, etc.), but there is no area code 121 in North America. It is an invalid number.
There is no area code 523 in North America (USA, Canada, etc.). International country code +52 is Mexico.
There is no area code 139 in North America (USA, Canada, etc.). North American area codes cannot begin with 1.
The America code is 1. In order to get the party you wish, the number is 1+specific area code+phone number.
In North America (USA, Canada, etc.), telephone area code +1 737 is an overlay on area code +1 512, serving part of central Texas including Austin.
No such area code in North America (telephone country code +1 = USA, Canada, etc.).