It's not obvious where this app came from. According to the answer to this question, it probably is an app that was incompletely synced with iTunes.

There's nothing to worry about, and you don't need to do anything about it.

Answer from Carl on Stack Exchange
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Apple Community
discussions.apple.com › thread › 253978204
Null in my contact - Apple Community
Simple press "Edit" in the top right corner, then select the label for the number, which will be just to the left of it. You can then change it to whatever you like. ... The value 'null' is used whenever the device cannot find an expected value. In this case, it most likely means that it cannot ...
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Apple Community
discussions.apple.com › thread › 253184830
FaceTime call says null - Apple Community
Looks like no one’s replied in a while. To start the conversation again, simply ask a new question · I want to know why my FaceTime call is not working it says null
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Akron Beacon Journal
beaconjournal.com › story › business › 2019 › 01 › 29 › null › 6165891007
null
January 29, 2019 - Its online support page noted that there was a technical issue with the application and that Group Facetime "is temporarily unavailable." Apple had introduced the 32-person video conferencing feature in October for iPhones, iPads and Macs.
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Apple Community
discussions.apple.com › thread › 251822790
Notification popped up saying “null” is u… - Apple Community
I just got off a facetime call when this appeared, and it was a notification with a settings icon. it said something like (null) has access to your cameras, microphone, files etc. and when I swiped to see where the notification would take me nothing happened, it just stayed on the home screen.
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MacRumors
forums.macrumors.com › iphone, ipad, and ipod touch › iphone › iphone
What does NULL mean | MacRumors Forums
September 15, 2022 - Null is a computer term for the concept of nothing. So it can normally be on of two things, no information or there was an error in the program that created the text and when all else fails it just puts in null.
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Apple Community
discussions.apple.com › thread › 253811200
(Null) At the end of the contact name. - Apple Community
April 12, 2022 - ... Since this only happens with the one contact, and only when it is copied and pasted, most likely there is something in that data causing the issue. Typically, "null" will appear when the device is looking for some data to fill in a field, but is not finding it.
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Narkive
community.openmoko.narkive.com › sf3r68wu › phonelog-missed-call-null-name-and-number
Phonelog: missed call "NULL" name and number
- Why didn't the phone do anything (ringing/vibrating, missed call notification) when apparently somebody tried to call? NULL means hidden number. Kind of expected that one :-) A programmer can understand this, obviously, but from an end user perspective it is not very meaningful.
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TikTok
tiktok.com › discover › what-does-null-mean-on-the-phone-call
What Does Null Mean on The Phone Call
TikTok - trends start here. On a device or on the web, viewers can watch and discover millions of personalized short videos. Download the app to get started.
Find elsewhere
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Reddit
reddit.com › r/ios › what is the “null null” means?:v
r/ios on Reddit: What is the “null null” means?:v
November 26, 2022 - Someone didn’t checked that field for null values. ... Nothing. Literally. ... This happened in my iPhone when I authenticated using the code that I received in my Watch.
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Apple Community
discussions.apple.com › thread › 252398304
FaceTime allow (Null) to access. - Apple Community
You can find out more information ... team. You may vote for any posts you find helpful, or search the Community for additional answers. FaceTime allow (Null) to access....
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Blogger
shudhtech.blogspot.com › 2019 › 03 › how-to-fix-null-message-on-iphone-allow.html
How to fix NULL message on iPhone - "Allow (null) to access"
March 17, 2019 - In most of the cases the NULL app is shown in place of a app that is not downloaded or loaded properly in iPhone after iOS 12 upgrade.
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TikTok
tiktok.com › discover › what-does-null-mean-on-a-ft-call
What Does Null Mean on A Ft Call
TikTok - trends start here. On a device or on the web, viewers can watch and discover millions of personalized short videos. Download the app to get started.
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Apple Support
support.apple.com › en-us › 105088
Use FaceTime on your iPhone or iPad - Apple Support
Learn how to use FaceTime to make video and audio calls on your iPhone or iPad.
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Apple Community
discussions.apple.com › thread › 250673495
What dose null mean - Apple Community
Null generally means an empty value in something. If you're having an issue after the update, answering the following can help clarify the issue: ... Which version of iOS is on your iPhone? You can find this in Settings > General > About > Version. Have a great day.
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Apple Community
discussions.apple.com › thread › 7654895
Talk to text sent from "null" - Apple Community
September 8, 2016 - She has an iPhone 5c and tries sending me a text stating my full name and SIRI even repeats that it is sending the message to the same name she said. Then SIRI says it will send the message. I do not receive anything! And when she looks at the message it says it was sent to NULL.
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Wikihow
wikihow.com › computers and electronics › computer networking › wireless networking › what does “facetime unavailable” mean? 8 simple fixes
What Does “FaceTime Unavailable” Mean? 8 Simple Fixes
January 13, 2024 - Learn why someone's FaceTime may be unavailable when you call When you can't FaceTime someone, it usually means the server can't connect due to poor connection, no Wi-Fi, or even an outage. FaceTime Unavailable doesn't necessarily mean...
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Reddit
reddit.com › r/ios › (null) is using camera access to control connected cameras. error message.
r/ios on Reddit: (Null) is using camera access to control connected cameras. Error message.
November 5, 2020 -

(Null) is using camera access to control connected cameras.

I searched it up, and really didn’t find much help. Is my camera being hacked or something? I don’t remember the exact error message, this text is copied from one on the internet, but I think mine said something along the lines of this, and access to photos too. I’ve heard stories of this happening on computers and such, so if I get this on my phone, should I be scared? I’m literally trying to hide my face from my phone right now, even if this doesn’t mean what I might think it does, this is worrying.

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Hi gillescoens,So my understanding is that you found in your iPhone's settings an app that doesn't appear anywhere else. You don't know what it is and are concerned with your data security, is that right?It is hard to say where this came from, but it is possible that this is just an app that was incompletely synced. I would suggest that you re-sync your iPhone with iTunes on your computer to see if the issue resolves itself. This article shows how - Sync your iPhone, iPad, and iPod with iTunes using USB.Thanks for using Apple Support Communities.Sincerely.
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I had a similar issue just now after upgrading my iPad 3 to iOS9 but was due to a NewsStand App. Fixed it using a combination of the comments inRe: "Null" app can't be deletedRetracing my steps:1. Upgraded to iOS92. As 'NewsStand' has been discontinued a new Folder with all my old NewsStand Apps appeared.3. As I had no more need for these deleted all these apps & folder4. Then just happened to see the same (null) app under main Settings Page as the OP Joeden19465. Then from 'Settings' clicked through 'General --> Storage & iCloud Usage --> Storage: Manage Storage' 6. Scrolled down (as have many ,many apps this took a while) but found the null icon and tried to 'Delete App'.7. Restarted Settings but (null) app was still there - (maybe should have tried a hard reset to see if it had disappeared)8. Repeated steps 5 & 6 and found a version number 2.1.739. Ran a Google search on 'version 2.1.73 ipad' and had seen halfway done the list 'BBC Good Food Magazine' - one of the apps I deleted in step 3.10. Redownloaded app, opened up 'BBC Good Food Magazine', ran 'restore purchases' (but had none), iPad froze and automatically rebooted.11. After reboot went back to 'Settings' and (null) app no longer there. Yippee!!!12. Repeated step 5 and found the app 'BBC Good Food' and deleted it.iPad 3, iOS9
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MacRumors
forums.macrumors.com › macs › macos › older macos versions › macos mojave (10.14)
My phone number as (null) in Preferences | MacRumors Forums
May 13, 2019 - You can try editing your AppleID account - https://appleid.apple.com/account/manage Your iPhone number should be listed in "Reachable at" If not, you can add your phone number there. You may need to sign out of both Facetime and iMessage on your iPhone. Change your phone number as you want it, then sign back in to iMessage and Facetime.