if you're still clinging to your iPhone 5 for dear life, you'll want to be sure it's running the latest available software -- the consequences could be serious if you don't. Apple has started warning iPhone 5 owners with full-screen alerts that they'll lose key online features (including email, web browsing, the App Store and iCloud) if they don't update to iOS 10.3.4 before 12AM UTC on November 3rd. The GPS time rollover issue that started in April will throw off features that require the correct date and time, Apple said.