1. Please press the contacts icon at the top right corner
2. Please press the arrow icon at right side of your name
3. Press the 3-points at right side to get the menu
4. Click "Change Phone Number" button
5. Input your Pin code to verify
6. Input new phone number (Note: don't forget to select the right country code)
7. Input 4-digit code received by your new phone number
8. Done, change successfully!
Change Phone number won't change your Mixin ID, and won't change your PIN code either.