How does WhatsApp on Android check which contacts in your address book have installed the app? I have to create an application that requires this type of contact synchronization.
I have a simple approach for this, but I'm not sure. Perhaps when the user registers his account in Whatsapp, the application will insert his number into the online database, and after registering the account in whatsapp she will receive your local contact numbers and look for them in the online database.
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