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How does WhatsApp deal when you change your SIM card into a new phone? I mean, how does it know it's you on your new phone?

• bvdbijl 14y ago
  When you install you make a new password by sending an SMS to your phone to verify that you actually own the number. If you change a SIM card in a phone it will keep using the same Whatsapp number
  • sgehlich 14y ago
    I like the use of the word "password". If they would at least implement a password, the whole thing would be a lot more secure.
    • bvdbijl 14y ago
      They should have made the password random, it's saved anyways.
• nrbafna 14y ago
  I have tried some of the cases: 1. Re-install whatsapp on the same phone and same SIM : you have to go through the entire setup process again. You're asked for your phone number, whatsapp sends a sms to that number to confirm. If you had previous backup of chats, it restores that. 2. Insert SIM into a new phone, without whatsapp previously installed: Same as 1. 3. Change SIM in the same phone and whatsapp previously installed: Nothing changes. Whatsapp runs using your previous number and that is displayed to all the contacts. On re-installing, 1. is repeated.