Send Alerts on Mobile Phone

Hello All,

I want to send the alerts to multiple people at same time on their mobile phone.

use-case ==> we have application where we do allocate the seat to candidate for exams, once the seat is full we sent alert to their respect center member(client) that you seat is full close the center. previously we did that using email integration, but now we want to do this using mobile phone alert.

note : - we don’t want any app which need to be install for alerts.

is it possible to achive as i tried using pushover grafana On call but this 2 need to be install on our phone. which is not our requirment as we want that alert should send one mobile number just like a text message.

please let me know is it possible or not?

Thanks in advance.