Will my contacts see I have whatsapp?

Hi I've recently got whatsapp, and I'm wondering whether my contacts on my iPhone will see that I have it, as I do not want my sisters to find out as they are really annoying and will probably message me every 5 minutes.

If the person has what's app and they also have your number, then they can open whatsapp and find out that you have whatsapp too as it tells them

Yes when you have whatsapp on your whatsapp contact list is everyone on your phone's contact list who has whatsapp so naturally you appear on theirs. I don't think you can remove yourself from that but you could just put your status as busy and hopefully they won't bother you

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