window.location.href = "tel:02-xxxx-xxxx" Can the development team modify the screen text? Or can the country code be erased? What are the reasons for continuing to be "on the phone" if the country code is automatically attached to the phone like this?

window.location.href = 'tel:0216700310'; I ran the code in an IOS environment. The number was displayed when the call button on the device appeared. However, other IOS devices besides some devices came out as a number starting with +82, and I received feedback that the call was not connected properly. I wonder what could be caused by only some devices. And I would also like to ask what can be done to allow the numbers on the code to be displayed and called as they are.