On Sunday, Nov. 3 at 2 p.m. eastern time, some iPhones or iPads released in 2012 or earlier will stop working correctly unless they have a software update from Apple.

Some devices such as iPad 2, iPad mini, iPad 3rd, iPhone 4S, and iPhone 5 generation could be the affected models, according to Apple. Released in 2012, iPhone 5 could lose access to apps, email, and web browsing so the issue is particularly pronounced for it.

In particular, Apple said on its website that iPhone 5 phones that do not install the iOS 10.3.4 update might not be able to access email, download apps from the App Store, or browse the web, and will no longer be able to connect to online services which require the correct date and time.

Because on Sunday, Nov. 3 a GPS issue could cause older phones to stop working properly, Apple has released specifically for them a new version of old software.

You will need to update by plugging your phone into a computer and won’t be able to download the update in the iPhone settings menu if you miss the deadline.

some iPad Mini, iPad 2, and iPad 3rd generation models and iPhone 4s devices with a cellular chip will no longer be able to maintain an accurate GPS position without an update to iOS 9.3.6 or they.

If you have an iPhone 5, it’s especially important to continue to use functions that rely on correct date and time such as iCloud, App Store, email, and web browsing, using your computer and updating your device’s software wirelessly before November 3 to maintain accurate GPS location.

Some Apple services can update newer version of iOS which  is required to sign up for so most iPhone users probably already have much on their devices newer software and even able to connect to new Apple hardware products like AirPods Pro.