Prompt When Trying to Dial a Phone Number Using Tel:// Scheme on iOS 10.3

Prompt when trying to dial a phone number using tel:// scheme on iOS 10.3

This is listed as a known issue in the 10.3 release notes.

https://developer.apple.com/library/content/releasenotes/General/RN-iOSSDK-10.3/

openURL

When a third party application invokes openURL: on a tel://,
facetime://, or facetime-audio:// URL, iOS displays a prompt and
requires user confirmation before dialing.

It is also listed in the Security content of the 10.3 update, so I'm assuming this a new feature that is here to stay.

An issue existed in iOS allowing for calls without prompting. This
issue was addressed by prompting a user to confirm call initiation.

ios User Prompt when making outgoing call via URL Scheme 10.2+

Unfortunately the version 10.3 to restricted the direct calls phone and facetime.

Check yourself:

https://developer.apple.com/library/content/releasenotes/General/RN-iOSSDK-10.3/

https://support.apple.com/en-gb/HT207617

Call number in iOS

Based on your description, seems you're trying to access a url starting with tel:// which your application is denied access. If you do have access to that domain, access it via your credentials.

Is there a way to make a hidden call from an iOS app through the telprompt URL scheme?

Have you tried url-encoding the # ?

"telprompt://%2331%23\(number)"

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