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If you switch between two iPhones regularly, you’re going to love this new feature.

Brynn Putnam and Tristan Walker have already done something that most founders only dream about: created companies so compelling that bigger outfits bought them. Putnam, a trained ballerina with a small chain of boutique studios, built the connected-fitness company Mirror and sold it to Lululemon for $500 million in cash less than three years later.…