Since January, all kinds of Android phones and tablets have been collecting the addresses of nearby cellular towers and sending the encrypted data to Google’s push notifications and messaging management system when connected to the internet. It’s a practice that customers can’t opt out of — even if their phones are factory reset.
Sounds nice.
Yeah I don't like this either. Apparently the data was never stored and only used to allow better/faster data/message transfer. It could be intercepted if your phone is compromised though, which isn't good. Either way, they have since stopped this practice (so they say...).
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