[pedro_hab]

In Brazil there is a 3 second delay before calls start charging. [1]

So we would call multiple times, speaking fast during the first 3 seconds then hanging up.

Then they blocked it, after 10 3 sec calls calls and you couldn't make calls for a while.

[1] https://www.anatel.gov.br/hotsites/conversao_pulso_minuto/ta...