* 67 in phone number for iOS application

I know that you can dial the extension after you dialed the phone number from the application, but I cannot find a way to add * 67 or block the call in front of the phone number for my iOS application. I tried different versions of this, but nothing worked. Does anyone know if this is possible or Apple does not support this feature?

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No, It is Immpossible.

You cannot force the iPhone to dial *or #with tel. Apple documents its support for URLs telin the Apple URL Reference Schema , which states the following:

, URL * #, "" .

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