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When i charge my phone via wall outlet i feel mild current flow in aluminium back cover of my phone. what is the problem with the device ????
Most probeble the problem will be with the charging port of your fone. Try changing the adapter once, and source, connect it to the USB (if ur port is usb, eventhough the amp will be half of what we get from the adapter, still worth a try). And if still the problem persist, then u may have to change the port I think... 
i changed the charger still it is there. is it a serious issue or it can be ignored as it happens only when put to charge on wall
I'd recommend sending your handset for service so it can be examined. Repair details can be obtained by contacting your local support team directly. You can find contact details here: http://bit.ly/wPKtf6
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Hmm, then most probably its because of ur port I think. You should goto an Authorised service Center...