Vodafone is the second British telecommunications company in two weeks to be on the receiving end of a serious hack.
The 16-year-old was arrested in west London on Thursday, and has since been released on bail.
Police are holding a 15-year-old boy for questioning in connection with last week's cyberattack on the UK broadband provider.
This is the second breach at the company in the last 12 months. TalkTalk acknowledges that some of its data wasn't protected by encryption.
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