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On 10 June 2013, Apple announced that it would install a "kill switch" on its next iPhone operating system, due to debut in October 2013. A study by the London School of Economics found that banning mobile phones in schools could increase pupils' academic performance, providing benefits equal to one extra week of schooling per year. China has proposed using this technology to track the commuting patterns of Beijing city residents. In the UK and US, law enforcement and intelligence services use mobile phones to perform surveillance operations. Apple's iPhone 13 Pro Max is the ultimate mobile content creation machine, with the best camera and longest battery life of any iPhone. The S22 Ultra is the true successor to the Galaxy Note line, delivering all the excellent Samsung phone features while making no concessions for size, weight, or price. The Samsung Galaxy S22+ blends top-notch connectivity and performance with the best mix of features and size for the price, m