Hi there Santosh,
Thanks for writing into Community, I'm Talar from the Atlassian Statuspage support team, happy to help!
There can be a few reasons for SMS not being sent out:
Please take a look at these reasons, and if none are relevant in this case, please submit a support ticket (https://support.atlassian.com/contact/) with us with the Incident ID + the number that didn't get the notification and we can investigate further.
Regards,
Talar
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