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The reason for the 10,000 foot requirement is there is a LOT more air traffic below 10,000 feet. The airlines run what is called a sterile cockpit below 10,000. NO talking, except for thing directly related to the flight. NOTHING. There were several incidents that occured when due to chatting, radio call were missed.
As for interference, I can hear my phone ring, before it rings, in several cars. Multiply that by up to 550 people (A380) and you can have an issue.
As for the rules, the FAA doesn't ban their use. The FAA requires the that the operator (airline) determine what is safe and what is not safe. So with airlines running near 0 profit (or at a loss) who do you think is going to pay for the testing required? The reason the pilots (only on some airlines) can use iPads instead of paper charts is that it is easy to test two specified devices in a specific places on the aircraft.
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