4 ms·Pretty sure Android does. TikTok knew my phone number before I gave it to them.by omarchowdhury 7y agoPretty sure Android does. TikTok knew my phone number before I gave it to them.buildzr 7y agoOn Android you need to give it the READ_PHONE_STATE permission.tomp 7y agoCould be as easy as a friend of yours uploading their whole address book (ostensibly “to find friends”)