6.1.2 LET'S GET STARTED: WHATSAPP
To create a WhatsApp account, you need a smartphone and maybe a SIM card. For each SIM card and phone number, you can only create one WhatsApp account. One WhatsApp account can only be used on one smartphone at a time. It is not possible to use the same account on several smartphones.
WhatsApp Web
WhatsApp can not only be used on your smartphone, a desktop version is also provided: WhatsApp Web, (https://web.whatsapp.com/).
6.1.3 LEGAL PITFALLS
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Please note: The following text was not written by a lawyer. It should only be considered a recommendation without any guarantee. Please contact your lawyer if you need binding legal advice
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What is allowed when companies use WhatsApp for marketing purposes? What has to be observed with regard to data protection, advertising law and other pitfalls? Is commercial use of WhatsApp allowed according to their General Terms of Use?
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The last one can be answered as follows: WhatsApp allows communication between private people and companies for commercial purposes (last update of General Terms in August 2016). Sending offers by WhatsApp is allowed. Corporate communication using WhatsApp is possible. As for private contacts, users can block contacts if they consider messages spam. Third-party banner ads are not allowed on WhatsApp.