Firstly, you could ask that person to sign in to icloud.com and erase your iPhone from their iCloud account. Once signed in, they can do this by clicking Find iPhone. Once the iPhone has been found, they click All Devices, then their old iPhone, and then they select Erase iPhone.
Here are the steps to Delete Someone Else's iCloud Account:
Open the Settings app on your device.
What to Know. First, select an email from the sender you want to block, then select the gear icon and go to Rules > Add a Rule. Next, choose is from > email address to block. Under Then, choose Move to Trash > Done > Done.
How to get rid of someone else's Apple ID on your iPhone
Locate a family member's or friend's device If you're part of a Family Sharing group, you can use Find My iPhoneFind My iPhoneFind My iPhone: If you misplace your iPhone, iPad, iPod touch, or Mac, the Find My iPhone app will let you use any iOS device to find it and protect your data. Simply install this free app, open it, and sign in with the Apple ID you use for iCloud. on iCloud.com to help locate any family member's device. Their devices appear below yours in the Devices list. Each family member must set up their devices to share their locations with other family members.
Go to "Settings" > "iCloud" (your name) and then "Family Sharing". Tap "Add member" and invite the person via iMessage. Enter the email address of the person sharing and send the invitation.
Tap your name (or the previous owner's name) in the top-right corner of the App Store's landing page. This brings you to the Account screen. Scroll down and tap Sign Out, which can be done without having to enter a password.
Spy apps are another way iCloud can be hacked into without a password. To use them, the person needs access to the target's device to download and install a spying app. These apps prey on the “spy's” insecurities, ensure that their worries are reasonable, and then lie about the activity being safe and legal.
In the My Devices section, you'll see a list of all the devices signed into your iCloud account. Click one of them. 4. In the Devices pop-up window, click the "X" to the right of each device and confirm you want to remove it.
How to FaceTime Call an Email Instead of a Number
How to Call Apple Customer Support by Phone. You can contact Apple's customer support by calling 1-800-275-2273 in the United States.
It depends on your version of iOS but it is possible that the iCloud-synced list of blocked phone numbers could mean that they can block people in your contacts so you won't receive any messages, including SMS.
Here's how to turn off iCloud Photos on your iPhone or iPad.