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I have tested two android phone as soon as i plug the phone to charger or powerbank the internet speed drops like 50% to 80% is it normal?

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    One reason could be radio noise generated by phone charger. Even sometimes touch panel becomes non-responsive or over-responsive. Particularly when AC power source isn't pure sine wave e.g. from a cheap UPS. Ideal solution is to use a linear power supply charger but that's not practical for phones. A good quality charger produces less interference. – Irfan Latif Oct 4 '19 at 19:40

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