Check the links below, it will help you to know the actual concept!
Sms bomber working - How Does SMS bombing spam works?
https://www.reddit.com/r/HowToHack/comments/8nngnv/how_to_perform_call_flooding_attack_tutorial/
Check the links below, it will help you to know the actual concept!
https://www.reddit.com/r/HowToHack/comments/8nngnv/how_to_perform_call_flooding_attack_tutorial/