There may be service fees when you exchange currency determined by where you exchange. Some banks will charge a fee, some only underneath a certain amount of money, while some not at all. Banks and currency exchange stores can exchange your international currency back again to US Dollar - https://financefeeds.com/fa/برترین-ارز-دیجیتال-برای-خرید-۳-کوین-میم-که-می‌توانند-تا-پایان-سال-۵۰۰۰-دلار-افزایش-قیمت-داشته-باشند/