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Why is it risky to charge a phone from a free USB port at a bus station or airport?

Pourquoi est-il risqué de recharger un téléphone sur un port USB gratuit dans une gare routière ou un aéroport ?

Answers
AA tampered port can pass data or malware as well as powerUn port trafiqué peut transférer des données ou un logiciel malveillant, pas seulement du courant
BPublic ports always charge far too slowly to be usefulLes ports publics chargent toujours beaucoup trop lentement
CIt automatically cancels the phone's warrantyCela annule automatiquement la garantie du téléphone
DUSB charging slowly damages the SIM card insideLa charge USB abîme lentement la carte SIM
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