Just found easier way to start a WhatsApp chat without adding the phone number to phonebook. Apparently WhatsApp officially provide a site to do that. Open http://wa.me/<phone number in international format>. Example, http://wa.me/628160000000 to start chat with +628160000000.
Informasi yang bermanfaat om, terkain materi NC dan NO bisa kunjungi: https://www.kelasteknisi.com/
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