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The Lumia 920, on the other hand, has only two ports: a micro-USB charging port and the headphone socket. Yet, even that meagre number of slots caused headaches for Nokia's engineers, according to Shields.
"The micro-USB port is an RF [radio frequency] nightmare," he said, adding that it can interfere with the various other radios in the device without proper shielding. "Wireless charging is effectively a radio, so is NFC. Then you've got LTE, Wi-Fi, Bluetooth - and you've got a lot of antennas."
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