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The 7805 is a linear regulator, so it just dissipates the excess voltage (9V down to 5V) as heat and you would throw away precious energy/capacity.A buck converter has a much higher efficency (around 80-90%), because it's a switching-mode regulator so you can use the given capacity of your 9V battery nearly completely for charging your phone.
Most 9V batteries have around 300-600 mAh capacity, so don't expect to fully charge your phone (most phones have around 2000-2500mAh capacity)
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