Windows Phone. Chats.
Using Click to Chat.
WhatsApp's Click to Chat feature allows you to begin a chat with someone without having their phone number saved in your phone's address book. As long as you know this person’s phone number, you can create a link that will allow you to start a chat with them. By clicking the link, a chat with the person automatically opens. Click to Chat works on both your phone and WhatsApp Web.To create your own link, use
https://wa.me/<number> where the <number>
 is a full phone number in international format. Omit any zeroes, 
brackets or dashes when adding the phone number in international format. Please keep in mind that this phone number must have an active account on WhatsApp.Use:
https:// wa.me/15551234567Don't use:
https:// wa.me/+001-(555)1234567To create your own link with a pre-filled message that will automatically appear in the text field of a chat, use
https:// wa.me/whatsappphonenumber/?text=urlencodedtext where whatsappphonenumber is a full phone number in international format and URL-encodedtext is the URL-encoded pre-filled message.Example:
https: //wa.me/15551234567?text=I'm%20interested%20in%20your%20car%20for%20saleTo create a link with just a pre-filled message, use
https://wa.me/?text=urlencodedtextExample:
https:// wa.me/?text=I'm%20inquiring%20about%20the%20apartment%20listingAfter clicking on the link, you will be shown a list of contacts you can send your message to.
