Finding channels consentually via address book

• Ability to consent to your contacts finding you via phone numbers
• Ability to find your contacts who have consented to be found
• Clear disclaimer and consent for uses of phone data
• Ability to provide phone number (done in onboarding, should this be used for 2fa and rewards too?)
• Ability to skip

See https://www.sketch.com/s/d887e4f1-0a63-43d2-96da-0db4201ef62f/a/nYoGRp