WhatsApp and Signal have different approaches to this trove of information. If you allow address book sharing, it may also be able to collect details on your friends and other contacts. For example, your app might know your name, phone number, location, data usage habits, and much more. Messaging apps often have the ability to collect information about you based on information available on your mobile device. There's more to your overall security than just the encryption, though, and it pays to compare some other aspects of WhatsApp and Signal.
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