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Without the passcode, you can't have Face ID or any kind of security on your iPhone. But if you're happy with that, here's how you can get rid of it.
Although your Apple Watch's passcode feature keeps your personal information secure, you may want to turn it off from sometimes. Here's how to do it.
Touch "Turn Passcode Off" and re-enter your passcode to deactivate the setting. Henceforth, your iPad will not require a passcode prior to unlocking, rousing or using it.
To turn off the password on your iPhone, you'll need to open the "Passcode" menu in your Settings app.
You can turn off the passcode on your Apple Watch through the Watch app on your iPhone, or directly from the Settings app on your Apple Watch.