Think you know iOS inside out? Well, think again. Unlock your iPhone's full potential with these hidden tweaks.

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Excel's Total Row uses smart SUBTOTAL logic to ignore hidden data, adapt to filters, flag text errors, and measure performance volatility.

With more than a decade of experience, Nelson covers Apple and Google and writes about iPhone and Android features, privacy and security settings, and more. Matt Elliott is a senior editor at CNET ...

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