Cannot get verification SMS on iMessage

I have switched recently my whatsapp from android to iPhone. I’m unable to get verification code SMS or call. I applied all troubleshooting but nothing was helpful.

i also tried to open my whatsapp again on android and there I received verification call, meaning by, there is some issue in logging in via iPhone.

I have been trying from 24 hours but every time I get a message that “ There is some issue in sending SMS to your number”. And same goes for call

Any solution or guidance?

[Re-Titled by Moderator]