Hi, can I get your WhatsApp number?
Would you be comfortable sharing your WhatsApp number?
Can we continue this on WhatsApp?
What’s your WhatsApp number?
If you’re okay with it, please send me your WhatsApp number.
Can I message you on WhatsApp?
Do you use WhatsApp? If so, may I have your number?
Would you mind sharing your WhatsApp contact?
Can we chat on WhatsApp instead?
Please share your WhatsApp number if you’d like to stay in touch.