Is there anything like Telephony.SECRET_CODE in iOS? - ios

Is there anything like Telephony.SECRET_CODE in iOS? I need to open my application if international numbers are typed on phone dial pad?

I'm not sure what Telephony.SECRET_CODE is but you can't open an iOS app from the phone app.

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iOS start Viber or WhatsApp chat with number from an app

in my app you can save a contact with a mobile number. I'd like to make a menu of starting a chat with that number in WhatApp or/and Viber.
Is there a way now to open a Viber/Whats app with a chat open with certain phone number from another app?
Thanks in advance

iOS SDK for launching SMS based support chat from hyperlinked phone number?

When I search for my ISPs phone number from an iPhone running iOS 13.5, I am presented with a hyperlinked phone number. When I tap on this phone number I receive a native iOS menu that allows selecting a live chat vs a call. Launching the live chat starts a chat session with their support team in iMessage. Additionally it shows this vendor as “Verified”.
How is this accomplished? Where is the documentation about this API? How do I become a verified vendor? Is this a special format in the hyperlink? I am aware of
href=“tel://...”
But is there some new URL format for trigging a native live chat dialogue?
I believe I found the answer it’s called apple business chat https://developer.apple.com/business-chat/

Make a telephone call and send different DTMF tones during the call in iOS

Is it possible to call a phone number programmatically in iOS and send different DTMF tones during the call?.
Basically I want an App to handle the IVR call. I don't know anything about iOS programming. I just want to know the feasibility so that I will put further effort.
Thanks
You cannot do this interactively within the bounds of the iOS SDK (ie, in an App Store app).
You can, however, build a tel URL. See the Apple documentation on phone links for more details if you think this will work for your needs.

How do I make a voice call in iPhone using Trigger.io?

I am building an app in which I need to let the user dial a phone number. Looking through the documentation, I could not figure out how to do that. There is a module for SMS, but none for voice. Is it possible to make phone calls from your Trigger.io app?
Yes, you can use a tel: url, for example:
Phone 123

How can I make a phone call using the speaker in iOS?

I know that using the URL with tel:// I can launch the phone app to make a phone call, but I don't know how to do the phone call with the speaker turned on.
Thanks!
There is no API for that I'm afraid. The tell:// is all the 'access' you will get as far as the phone application goes.

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