I had a company iPhone but left a year ago resetting the phone before I left. I don't think it has been used since but my old boss has bought it and wants to use it. He says that it is still locked into me and wanted my Apple ID

Question

i can't remember if it was different yo my normal one but I don't intend to tell him. He is now asking instead for my security questions answers.
IS there an thing I can do without releasing into to him?

Answer 1

Yes,
Go to Find My Phone, locate the specific Phone and remove it from your account,
Remove an iOS device you no longer have
If you no longer have the iOS device because you gave it away or sold it, you need to remotely erase it before you can remove it.
Sign in to icloud.com/#find with your Apple ID (the one you use with iCloud).If you’re using another iCloud app, click the app’s name at the top of the iCloud.com window, then click Find My iPhone.If you don’t see Find My iPhone on iCloud.com, your account just has access to iCloud web-only features. To gain access to other iCloud features, set up iCloud on your iOS device or Mac.
Click All Devices, then select the device.
Click Erase [device], then enter your Apple ID password. Because the device isn’t lost, don’t enter a phone number or message.
Note: If you’re trying to erase a family member’s device, that person will need to enter his or her Apple ID password on this device. 
If the device is offline, the remote erase begins the next time it’s online. You’ll receive an email when the device is erased.If you erase your iPhone 6 or iPhone 6 Plus and you have credit and debit cards in Passbook for Apple Pay, Find My iPhone attempts to remove your cards immediately, even if your iPhone is offline. For more information, see the Apple Support article Using Passbook.
When the device is erased, click Remove from Account.All your content is erased, and someone else can now activate the device.