I do not remember my old passcode

If you forgot the passcode on your iPhone, or your iPhone is disabled -

https://support.apple.com/en-us/HT204306

Mellybabystar92 Said:

"I do not remember my old passcode"

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Passcode for what?-

Do you mean the passcode?

Hold It Right There!:

Enter the passcode incorrectly too many times, and you'd likely be locked out for good. So, hold it right there, and refer to this link: If you Forgot the Passcode on your iPhone, or your iPhone is Disabled - Apple Support. It would be the one you've always entered. If you do not know it, then look for it in a location you may have stored it in.