If you allow access, contacts are continuously synced with Telegram. You can adjust this in Settings > Privacy & Security on mobile devices.
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如果您授权 Telegram，您的联系人信息将会被即时同步到 Telegram 云服务器。您可以在 Telegram 移动版应用中的设置项「隐私和安全」中修改此项设定。
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Deleted Account,
Dec 11, 2018 at 16:31