You can change your Whatsapp number on this same profile page by typing in old and new numbers. Simply click on the name, type the name you want to display with your number, and click the Save button. You can also change your name on WhatsApp here. So this is your answer to "How to give someone your WhatsApp details?" Step 4: You can find your WhatsApp username and mobile number registered for you.Step 3: Now, you can see your name at the top with your profile picture.Step 2: You will see a three-dot menu at the top right.Step 1: Launch the WhatsApp application on your Android phone.It is very easy to get a Whatsapp number on an Android phone, and you can find the details in the WhatsApp application. Part 1: How to Find My WhatsApp Number and Username on Android? Part 3: Frequently Asked Questions (FAQs)