It turns out that the ban on wireless devices has a lot more to do with possible interference for ground networks, rather than any danger posed to aircraft systems. The Federal Communications Commission (FCC) banned in-flight use of most cell phones and wireless devices in 1991, citing the reason of ground network interference. The Federal Aviation Administration (FAA) regulations uphold the FCC decision. But some airlines allow passengers to use cell phones in "airplane mode," which shuts off phone transmissions.
The FCC briefly considered lifting the in-flight ban on wireless devices, but eventually decided in 2007 to keep the current rules in place because there wasn't enough evidence to show whether in-flight wireless devices would cause harmful interference with ground networks. There also wasn't evidence demonstrating that the devices do cause interference, but the federal agency decided to play it safe.
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