Are my iPhones hacked?

SravanKrA wrote:

iOS / iPadOS devices cannot be hacked or infected with Virus / Malware / Spyware if it is updated to latest iOS/iPadOS, unless you have intentionally downloaded spurious softwares or unauthorised apps directly from internet and installed on your device or/and have Jail Broken.

This is verifiably false. On Apple's "About the security content of iOS 13.6 and iPadOS 13.6" support page for last week's update we can see numerous vulnerabilities that may lead to "arbitrary code execution", including some relating to WebKit (Safari).

Or consider CVE-2019-8646, a vulnerability that allowed attackers to read files off an iPhone just by sending a text through iMessage to it. Google's Project Zero team has a writeup on it, along with video demonstration. The vulnerability was introduced in iOS 12.1 and iOS 12.4. Between those versions, for the better part of a year, an up-to-date iPhone was vulnerable.

Security vulnerabilities are numerous and well documented, are fixed regularly in pretty much every release. So I don't think it's fair to assume that iOS/iPadOS has suddenly stopped having security bugs with the latest 13.6 release and it "cannot be hacked" anymore, when versions from a few weeks or months ago clearly can be, sometimes just by visiting a website.

iOS / iPadOS devices cannot be hacked or infected with Virus / Malware / Spyware if it is updated to latest iOS/iPadOS, unless you have intentionally downloaded spurious softwares or unauthorised apps directly from internet and installed on your device or/and have Jail Broken. 

It (Hacking) also depends on how careful are you in sharing sensitive and valuable informations of your iPhone such as Passcode, Password etc with your friends and family members.

Be careful when sharing the device's sensitive and valuable informations with friends and family members.

Thumb Rules:

1. Don't share Apple IDs
2. Don't Jail Break
3. Don't share sensitive informations pertaining to your device and payment methods
4. Beware of Phishing

I have same problem. my iPhone OS version is 13.5.1.

JetsamEvent logs have been created everyday. I learned that JetsamEvent log indicates largest process name when the memory is low.

What processes does JetsamEvent log indicate ? In my case, most of these processes are StoreKitUIService.

Sometimes the process is mail application such as Outlook. I don't know what is StoreKitUIService.

some web pages tell that StoreKitUIService is in the iOS simulator. however I am experiencing it in real my iPhone.

JetsamEvent log has been created when I didn't use the iPhone.

Also my iPhone experiences strange battery drains in the Setting and much data communication traffic in operator's traffic measurement application.

After the apple Id changed temporary, data communication traffic rate was down. but iPhone creates JetsamEvent log.

I had restored the iPhone with Mac several times. but JetsamEvent log still has been created everyday.

StoreKitUIService seems to be a hidden apple application in iPhone OS.

you can see it at /Applications/Xcode.app/Contents//Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/

Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/Applications/StoreKitUIService.app

however i don't know it is also in real iPhone device, some developers say SKStoreReviewController api which shows the review page in the application will invoke StoreKitUIService.app.

another developer says StoreKitUIService sometimes hangs or fails in the simulator.

but i am not sure, it is a bug in apple api or the application.

or, .. possibility of malware. unit42 of paloalto networks reported the malware 'YiSpecter' infects non jailbroken device on 2015.

There is nothing in the log files of your phone that is intended for use by the regular user. You'll drive yourself nuts trying understand it and, in the end, you'll find out that they don't mean anything is wrong.