Open Google Voice app with specific number - ios

I want to implement call feature without sharing my actual SIM number. So I am trying to use Google Voice for that. Is it possible to open Google Voice app and automatically select a specific number. I will perform the call action manually.
Is this possible?

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Spoof calling SDK for native iOS

Hello is there any API or SDK available for spoof call function in iOS ? As I need functionality where dialer add his own number and receiver number. The receiver will receive call from those number which added by the dialer (spoof number/ any number).
Please help if someone knows.
On iOS it's impossible to set the caller ID of a mobile call.
The only way to make a phone call from code is to open a tel://<number-you-want-to-call> URL. iOS will then take over and will open the native Phone app. Of course the SIM card's caller ID will be shown to the callee; there's no way to influence that (apart from hiding it, if your operator allows that).
If you wish to set another caller ID, you need to create a VoIP app and you need a VoIP backend that terminates the call on the telephone network.

Is it possible to integrate Google Assistant with my custom app?

I would like to integrate Google assistant inside my app. The idea is that I have a app which provides various press services, like giving latest news and such. I would like to integrate Google assistant for handling some particular requests. For example the user may ask, "what did the Lakers yesterday?" If i search this on Google or ask to the assistant, i will get a card with the score of yesterday's game. I would like, from inside my app, to replicate this interaction, that is sending the request to Google assistant and showing the answer that Google return to the user (or at least opening Google assistant with the answer)
Is such a thing possible?
I was looking at Google Assistant service sdk (https://developers.google.com/assistant/sdk/guides/service/python/) and it says:
The Google Assistant Service gives you full control over the integration with the Assistant by providing a streaming endpoint. Stream a user audio query to this endpoint to receive a Google Assistant audio response.
Is this possible only with audio interaction? I'm not quite certain this is the solution I should look into
The Google Assistant SDK Service allows you to send both audio or text to the Assistant and you'll get back responses including audio, display text, and rich HTML visual content.
For mobile apps, there's less support compared to Python, but it's still doable. For example, there's a version of the SDK for Android Things, which means for IoT devices like a Raspberry Pi. You can go through this project and remove all the IoT references, but it's something you'd need to do yourself.

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I am trying to create a way within my application to download voice mails. As of right now a user must manually go into his/her phone app and saved from there.
Is there a way to open Visual Voicemail with Swift, or at the very least the phone app without adding a phone number?

Is there a way to find out what voice the user has set for Siri?

I'm using the voice synthesizer in iOS and can see how to specify a specific voice or language for it to use, but can't see a way to find out what the user has selected as their voice for Siri and use that, which would be nice!

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.

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