returned for iphone without erasing

If you returned your iPhone without erasing the data, there is a potential risk that someone else may be able to access your personal information. It's important to take steps to protect your data in such a situation. Here's what you can do:

1. Change your Apple ID password: Start by changing the password for your Apple ID associated with the iPhone. This will help prevent unauthorized access to your iCloud account, which may contain personal information and data associated with your iPhone.
2. Enable two-factor authentication: Enable two-factor authentication for your Apple ID. This adds an extra layer of security by requiring a verification code in addition to your password when signing in to your account. This way, even if someone has your password, they won't be able to access your account without the verification code.
3. Remote wipe if possible: If you had the "Find My" feature enabled on your iPhone and it's still connected to the internet, you may still have the option to remotely wipe your device. Use the Find My iPhone/iCloud website or the Find My app on another Apple device to initiate the erase command. If the device is online, it will receive the command and erase all data.
4. Monitor your accounts: Keep an eye on your financial and online accounts associated with your iPhone. Look for any suspicious activity and report any unauthorized access immediately to the respective service providers.
5. Report the situation: If you returned your iPhone to a store or lost it in a public place, consider reporting the incident to the relevant authorities, such as the store management or the local police. This can help in case the device is found and the information on it is misused.

It's always important to take precautions to protect your personal information. If you have concerns or need further assistance, consider reaching out to Apple Support or consulting with a professional for specific guidance based on your situation.

Your data is not lost if you have a backup either on iCloud or iTunes.

If you see an iPhone or iPad unavailable message or "Security Lockout" screen

If you forgot your passcode, you can use your Apple ID and password to erase and reset your device without a computer.

Learn what to do if you see "[Device] unavailable" or "Security Lockout" on your iPhone or iPad.)

iPhone is disabled.

Following this process is the only way out if your iPhone is disabled. The steps given in this link will help you reset the passcode -> If you forgot the passcode for your iPhone, iPad, or iPod touch, or your ...

Regarding your data…

1. If you have an iCloud or iTunes latest backup, then there is nothing to worry about. If not read more...
2. You have synced your data to iCloud, then what you will get back is what you have synced to iCloud and uploaded to iCloud Drive; the information that is synced and stored in iCloud are, Contacts, Calendars, Bookmarks, Mail, Notes, Voice Memos, shared photos, iCloud Photos*, Health data, call history, and files you store in iCloud Drive. (*-If you had turned on iCloud Photos, your content is automatically stored in iCloud.)
3. You have imported your Photos & Videos to Mac/PC then they are safely residing there on Mac/PC
4. You have uploaded some of it to Cloud Drives using the Files app (iCloud Drive, Google Drive, OneDrive, DropBox, Flickr, box, AmazonDrive, Adobe Creative Cloud etc). The data remains there.
5. If you have not backed up or do not have the latest backup, nor imported nor you have synced or uploaded your data to cloud drives prior to the situation that you are in, then I am sorry, all your data is lost.