Apple has unexpectedly halted the rollout of its most recent iOS updates for a wide range of older iPhone and iPad models, just days after their release. On Monday, Apple released iOS 18.7.4, iOS 16.7.13, iOS 15.8.6, and iOS 12.5.8, targeting older iPhone models no longer receiving major iOS updates. "We're currently investigating an issue preventing some older Apple devices from connecting to our network, including calls to 000. We're working on this as a priority with Apple," Telstra said. For now, Telstra has advised affected customers to delay any software updates until further notice.