If you don't have the number on your contact list, it opens the Whatsapp listing all your registered contacts, so you can choose one. It doesn't work for me because I wanted to be able to send a message to a number which I may not have on my contact list. This way you must have the phonenumber on your contact list. On tests 1 and 2, it only worked with a plus sign on the country code: +5511999999999 In all tests, the number had to be complete, with country and location code without any initial zeros. (I think the Test 3 will also work for you because if the person visiting your site doesn't have you on their contact list, it's the only option that will allow it.) I've tried many approaches and I have a winner (see Test 3), here is the result of each one:
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