To call a cell phone from a cell phone, use 15-0000-0000
To call a land phone from a cell phone, use 0000-0000
To call your cell phone from the USA, use 011-549-15-0000-0000
To call a cell phone from a land phone, use 15-0000-0000
To call USA from your cell phone, use 001-000-000-0000
right?