Welcome to Android Central! Which phone? When you plug it in, do you see a lightning bolt appear in the battery icon? If not, then have you already tried different cables and charging plugs?
Is this only happening when you're charging from a computer's USB port?
Remember, actively using your phone uses power, and if you're doing something that's processor intensive, then the rate of power usage might still exceed the rate of charging, especially if you're using a weak power source like a computer USB port.
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