Forgetting your iPhone password can be a frustrating experience, but there are several steps you can take to regain access to your device without losing your data. Here's what you can do:

1. Use iTunes to restore your iPhone: If you have previously synced your iPhone with iTunes, you can use the 'Restore' feature to reset your device and remove the password.
2. Try using iCloud to erase your device: If you have Find My iPhone enabled and linked to your iCloud account, you can remotely erase your device and set it up as a new iPhone.
3. Use Recovery Mode: If the above methods don't work, you can put your iPhone into Recovery Mode and restore it using iTunes. Keep in mind that this will erase all data on the device.
4. Contact Apple Support: If you're still unable to recover your iPhone password, reach out to Apple Support for further assistance and guidance.

Preventing future password issues is essential for maintaining the security of your iPhone. Consider using a password manager to securely store and manage your passwords, enabling you to generate strong and unique passwords for each of your accounts.