No, once you "Erase all content and settings" your iPhone is basically back to factory settings and the new owner will not be able to sync with or sign in to your iCloud account. Also, have a look here concerning "Find my iPhone": support.apple.com/guide/icloud/remove-a-device-mmfc0eeddd/… Thanks for the answer!
No. Factory reset of iPhone doesn?t delete your information from iCloud or iTunes backup. The iCloud backup files are stored in Apple? s cloud servers while your iTunes backup files are saved on your PC or Mac drive.
Apple IDs are permanent. They do not disappear because you reset the iPhone. You can continue to use it normally after resetting the iPhone.
If you have synced your iPhone with iTunes, then you can use recovery mode to factory reset iPhone without iCloud password.
Sign out of all of your online accounts
Log out of Apple accounts including Apple Music, the App Store, and Find My Phone, and don't forget to turn off Activate Lock, remove your iPhone from iCloud, and sign out of other linked accounts such as Facebook or Twitter.
For example, formatting a Samsung device won't delete Knox Flag, or formatting a Windows device won't delete System32. Does a factory reset remove accounts? No. Resetting a device to factory settings will log you out and might delete the apps associated with your account from your device's memory.
It will also turn off iCloud, iMessage, FaceTime, Game Center, and other services. Your content won't be deleted from iCloud when you erase your device.
How to Reset Your iPhone Remotely Using iCloud. To reset an iPhone from a web browser, go to iCloud.com/find and log in with your Apple ID and password. Then click All Devices at the top of your screen and select your iPhone from the list. Finally, click Erase iPhone > Erase.
Thus all your photos will be removed from the iPhone. But if you have turned on the iCloud Photos feature, it won't delete photos on iCloud storage. On the other hand, as for restoring your iPhone from iCloud/iTunes backup, the pictures are stored in the backup will overwrite the old photos on the iPhone.
When you do a factory reset or choose to “Erase All Content and Settings”, the device obliterates the keys, rendering all user data on the device cryptographically inaccessible to anyone. This ensures that all your personal data does not get passed on to somebody else.
A factory restore erases the information and settings on your iPhone, iPad, or iPod and installs the latest version of iOS, iPadOS, or iPod software.
Choose Start menu > Settings > Apps > Apps & features. Locate iCloud, click Uninstall, then follow the onscreen instructions. If you have also set up iCloud Mail in Outlook, locate iCloud Outlook, click Modify, choose Remove, then follow the onscreen instructions.
Remove Activation Lock on the web if a device is offline
Go to www.iCloud.com/find. Sign in with your Apple ID and password. At the top, click All Devices. Select the device that you want to remove from iCloud.
On your Mac
Choose Apple menu > System Settings or choose Apple menu > System Preferences, then click Apple ID. Click iCloud. Select or deselect each app.
On iCloud.com, you can recover files deleted from both iCloud Drive and other apps within the last 30 days, whether you deleted them on iCloud.com or another device that has iCloud Drive turned on. However, you can't recover or restore files you permanently remove.
A factory data reset erases your data from the phone. While data stored in your Google Account can be restored, all apps and their data will be uninstalled. To be ready to restore your data, make sure that it's in your Google Account. Learn how to back up your data.
Important: A factory reset erases all your data from your phone. If you're resetting to fix an issue, we recommend first trying other solutions. Find out how to troubleshoot Android issues. To restore your data after you reset your phone, you must enter security info.
Once you select the factory reset option, it removes all your personal information and files. It includes all programs, videos, images, documents, or anything else on the device.
Most commonly, people reset their iPhone because they are experiencing major software errors, like issues connecting to networks or apps crashing. Resetting the phone to its factory settings should resolve these errors and restore normal functioning. It's also smart to reset your iPhone before selling it.
These two iPhone resetting options do different things. Reset All Settings will remove things such as Wi-Fi passwords and settings you have set on the iPad for Apps, mail, and many more, but it will not remove your data and media. Erasing All Content restored the device to its original state.
Remove your accounts, SIM and memory card
As part of the final preparatory process, you want to remove all your accounts configured on your device before doing a factory reset.
If your iPhone, iPad, iPod touch, Mac or Apple Watch is lost or stolen, you can erase it in Find Devices on iCloud.com. To sign in to Find Devices, go to icloud.com/find.