You can reset your Instagram password even using phone number. Make sure you have added your number on Instagram. If not, then you need email to reset the password. If yes, then follow the steps:
- Open your Instagram app.
- Now you will the option of log in or sign up to account. Tap on the 'forget password'.
- Now Instagram will send you a verification code on your phone number.
- Check the code and type it in the box.
- Now set a new password. This is your new password. Your password has been changed.