Open url tel scheme not working for some phone numbers - ios

Question

I am using the below code to dial a phone number that I get from contacts:
func dialNumber(number : String) {
let formatedNumber = number.components(separatedBy: NSCharacterSet.decimalDigits.inverted).joined(separator: "")
print("formatedNumber:", formatedNumber)
if let url = URL(string: "tel://\(formatedNumber)"),
UIApplication.shared.canOpenURL(url) {
if #available(iOS 10, *) {
UIApplication.shared.open(url, options: [:], completionHandler:nil)
} else {
UIApplication.shared.openURL(url)
}
}
}
Additional info:
var urlTest = URL(string: "tel:[phone]")!
print("UIApplication.shared.canOpenURL(url):", UIApplication.shared.canOpenURL(urlTest)) // Returns true
UIApplication.shared.open(urlTest, options: [:], completionHandler:nil)
var urlTest = URL(string: "tel:[phone]")!
print("UIApplication.shared.canOpenURL(url):", UIApplication.shared.canOpenURL(urlTest)) // Returns true
UIApplication.shared.open(urlTest, options: [:], completionHandler:nil)
The code works for numbers with Area code +1XXXYYYZZZZ and the phone number is dialed.
But it doesn't work for numbers like XXXYYYZZZZ.
If I open the contact using Address Book, the number XXXYYYZZZZ is recognized as a phone number. On clicking, the number gets dialed.
How can I get a similar behaviour as Address Book inside my app?
I do not want to add a region code +1 as the app will be used in other countries as well.
There are external libraries for identifying phone numbers but I'm trying to explore if there is a native solution.
If a number is not recognized, I even tried to open the contact in the address book so the user can dial the number from the contacts app, but it looks like address book is not a supported scheme.