Purchased for use during UK trip, USB ports do not function properly.

I purchased this for use during a UK trip, I live in the US. Yes, I needed an adapter to plug it into the outlet but that is not the issue. The USB ports do not supply a clean power for charging phones. This was tested on four separate iPhones and all yielded the same results, poor charging and an inability to use the phone while charging. If I used the power blocks supplied by Apple, it charged fine and the phone could be used while charging. My suggestion is to avoid this all together.

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