Android users have been warned to check their smartphone today after an old version of the software was dropped.
And it means anyone still using a device with it installed are at increased risk from hackers.
Android KitKat was first launched almost ten years ago.
If your smartphone is still using it you'll need to update to a new version of Android to stay safe.
But really old smartphones might not be able to, in which case you'll have to buy a brand new handset.
Fortunately, Google says less than one per cent of all devices run Android KitKat.
So the vast majority of people should be unaffected.
Most manufacturers had already stopped supporting devices running Android KitKat, which means their security is already weakened.
However, it's still worth checking.
The following handsets are affected by the move:
- Samsung Galaxy S4 Mini LTE GT-i9195 1.5GB RAM 8GB
- Samsung Galaxy Note II GT-N7100 2GB RAM 16GB
- Samsung Galaxy Ace 4 SM-G357F 1GB RAM
- Samsung Galaxy Grand Neo Plus GT-i9060I Dual SIM 1GB RAM
- Samsung Galaxy K Zoom SM-C115 2GB RAM
- Samsung Galaxy A7 SM-A700F 2GB RAM 16GB
- Samsung Galaxy J1 DuoS SM-J100H Dual SIM 512MB RAM
- Samsung Galaxy Ace Style SM-G310H 512MB RAM
- Samsung Galaxy Xcover 3 SM-G388F 1.5GB RAM 8GB
- Samsung Galaxy Note Edge SM-N915F 3GB RAM 32GB
- Samsung Galaxy Trend 2 Lite SM-G318H 512MB RAM
- Samsung Galaxy J1 SM-J100H 512MB RAM 4GB
- Samsung Galaxy Note 3 Neo LTE+ SM-N7505 2GB RAM 16GB
- Samsung Galaxy Grand Prime SM-G530F 1GB RAM 8GB
- Samsung Galaxy S5 Plus SM-G901F 2GB RAM 16GB
- Samsung Galaxy S III LTE GT-i9305 16GB
- Samsung Galaxy Young 2 SM-G130H Dual SIM 512MB RAM
- Sony Xperia E4g E2003 1GB RAM
- Sony Xperia T3 D5103 1GB RAM
- Sony Xperia C3 D2533
- Sony Xperia E3 D2203 1GB RAM
- Sony Xperia E4 E2105 1GB RAM
- Sony Xperia C3 Dual D2502
- LG G2 Mini D610 Dual SIM 8GB
- LG G Flex D955 2GB RAM 32GB
- LG F60 D390 1GB RAM
- LG L70 D320 1GB RAM
- LG L20 Dual SIM 512MB RAM
- LG L40 D160 512MB RAM
- HTC Desire 610 1GB RAM
- HTC Desire 620G
- HTC One Mini 2 1GB RAM 16GB
- HTC Desire 320 1GB RAM
- HTC Desire 820 2GB RAM 16GB
- HTC Desire 320 1GB RAM
- HTC One Mini 1GB RAM 16GB
- HTC One Max 2GB RAM 16GB
- HTC Desire 620 1GB RAM
- HTC Desire 816 1.5GB RAM
- HTC Desire 626 1GB RAM 16GB
- HTC Desire Eye 2GB RAM 16GB
- CAT S50 2GB RAM
- CAT B15Q Dual SIM 1GB RAM
- Huawei Ascend Mate 2GB RAM
- Yota Devices YotaPhone 2 2GB RAM 32GB
- Alcatel OneTouch Pixi 3 4027D Dual SIM 512MB RAM
- Doro Liberto 820 Mini 512MB RAM
How do I know what version of Android I have?
- Open the Settings app on your smartphone
- Go to About phone
- Select Android version
