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https://smscellbroadcast.wordpress.com/2019/07/28/decifrando-a-emissao-de-cell-broadcast-21-lisboa-da-rede-2g-gsm-da-altice-meo-altice-portugal/
Decifrando a emissão de Cell Broadcast 21 Lisboa da rede 2G / GSM da altice MEO | altice Portugal