People using an older iPhone or iPad models need to update their software or their phone will stop working.
Apple has said that iPhone 5 owners won't be able to connect to the internet unless they have iOS 10.3.4 from 12am on Sunday.
Those who don't update their devices could find Safari, emails, App Store, iCloud and maps all go offline.
The update will also affect iPhone 4S and older models of the iPad .
Apple products won't be impacted until November 3, 2019, reports Manchester Evening News.
Apple said: "If you don't update to the newest version of iOS available for your device before November 3, some models might not be able to maintain an accurate GPS position."
The affected models and updated software number
iOS 10.3.4 - iPhone 5, iPad (4th generation) Wi-Fi + Cellular
iOS 9.3.6 - iPhone 4s, iPad mini (1st generation) Wi-Fi + Cellular, iPad 2 Wi-Fi + Cellular (CDMA models only), iPad (3rd generation) Wi-Fi + Cellular.
This issue does not affect iPod touch or any iPad models that have Wi-Fi only. It also doesn't affect iOS devices newer than those listed above.
"It's always a good idea to keep the operating system on your iPhone or iPad updated. If you have one of the devices listed, it's especially important to update your device's software wirelessly or using your computer before November 3 to make sure that its GPS continues to work properly," warned Apple.
How to check your iOS version
To see if your device has updated, you can check by doing the following:
1. Open the Settings app.
2. Tap General, then tap About.
3. Look for the number next to Software Version.
If the update to iPhone 5, which was introduced in 2012, is not completed by the set date, users will be required to back up and restore their phones using a Mac or PC in order to update their device.
Last month, Apple unveiled three new iPhones - 11, 11 Pro, and 11 Pro Max.
