Get in touch with people on WhatsApp without having to save their numbers in your mobile calendar. To use just download the application UseAppZapp, enter the phone number with DDD in the text box and click the open button in Whatsapp and you're done. For it to work you must have Whatsapp or Whatsapp Business installed on your Smartphone. UseAppZapp only acts as a bridge to be able to use unsaved numbers in your WhatsApp calendar without having to save the contact in question!
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