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Based on the provided knowledge fragments, the ability to charge the Anker Power Bank (20,000mAh, 30W) while simultaneously charging a phone will depend on the product's configuration. Unfortunately, the provided knowledge base does not explicitly confirm whether this specific power bank supports pass-through charging, where it can be charged while it charges an external device. Generally speaking, many power banks support this feature, but not all. To determine whether this specific power bank supports charging and discharging at the same time, please refer to the product's user manual or technical specifications on its purchase page.
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