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~~No-phone-number-required, gratis, cross-platform, worldly and widely used VoIP application~~

No-phone-number-required, gratis and cross-platform VoIP application

I need to be available by smartphone for potential customers which generally all of them reside in a country different than the one I reside at.
Register-with-phone-line VoIP applications such as WhatsApp aren't good for me because I don't have and don't want to have a phone number based on the country of most of my potential customers.<br>
I could use my current phone number with WhatsApp but potential customers bumping across "unidentified" phone numbers may feel odd or as possibly going to be scammed; furthermore, I myself try to move between countries and seek not to rely on just one phone number.
What may be a smartphone application which is gratis, cross-platform (Android/Apple/etc.), worldly-used, widely-used and non-phone-number-based (rather, at-least-email-based) with which I could easily interact with potential customers in chat and/or voice and/or video?

I need to be available by smartphone for potential customers which generally all of them reside in a country different than the one I reside at.
Register-with-phone-line VoIP applications such as WhatsApp aren't good for me because I don't have and don't want to have a phone number based on the country of most of my potential customers.<br>
I could use my current phone number with WhatsApp but potential customers bumping across "unidentified" phone numbers may feel odd or as possibly going to be scammed; furthermore, I myself try to move between countries and seek not to rely on just one phone number.
What may be a smartphone application which is gratis, cross-platform (Android/Apple/etc.) and non-phone-number-based (rather, at-least-email-based) with which I could easily interact with potential customers in chat and/or voice and/or video?

smartphone VoIP

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