Want to register using Phone number with OTP like Whatsapp in cross platform

Hi everyone,

I am new to app development. I am having couple of doubts to clarify.

--> How to register using phone number with OTP like whatsapp - I need a flow of working principal and also some sample coadings.

--> And also how to retrieve phone numbers in contacts that are registered in our app like whatsapp.
I need a flow of working and also some sample coadings to implement...

Please Advice ASAP...

Thanks,
Prabakaran.

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