Any suggestions for what to do on iOS? Unfortunately, it's not always so easy to not share contacts with certain services. For instance, WhatsApp works just fi

Any suggestions for what to do on iOS? Unfortunately, it's not always so easy to not share contacts with certain services. For instance, WhatsApp works just fine with a telephone number but it actively encourages users to upload their contacts - assumably consumed by (the) Facebook (group of businesses) as part of its social graph.