Other than for 2FA via a cell phone for account security ("Second Factor Authentication" which is optional, and you don't have active on your account) QRZ doesn't use phone numbers for anything. Where is it you need to see your phone number? Or are you asking how to ENABLE the 2FA with your smartphone number? If that's the case, you simply click on your call sign from any forums page, scroll down to "Two Factor Authentication", click that, and follow the simple steps. Dave W7UUU