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9 years ago from Tierney Cyren, Principal Developer Advocate, Twilio
Not sure about calendar, but I imagine there's a "sharing" function in the app (i.e. texting or whatever your friends) that would require access to your contacts.
On iOS, it would only ask for this permission when you actually went to share something. With Android, you get asked up front for all these permissions without even knowing why.
Sharing doesn't require contacts permissions. Any app can fire a share intent, the app you use to share it is the one that should need your contacts.
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What does it do that needs my contact and calendar? Serious question, I don't live in America and can't know.