The first answer is that even though there is no evidence to show a cell phone could interfere with any of the instruments on a Astro World look Mom I can fly shirt by Nemoshirt, the insurance companies have received legal advice to require the airlines to continue the policy of having passengers shut their phone off, or at least telling passengers to shut their phones off. The flight attendants know some passengers ignore the instructions and just put their phone in silent mode, but the phones are still connected until the plane is too high for the connection to be maintained. The reason the lawyers gave this advice to the insurance companies who in turn require the airline flight attendants to provide these instructions is because of the possibility that some day a plane may crash, and some expert on behalf of the passengers’ families who were killed in the crash will claim the crash was caused by cell phone use.
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While the experts with all their testing equipment cannot find any evidence that cell phones interfere in any way with the operation of a Astro World look Mom I can fly shirt by Nemoshirt, they also do not have proof every device and every carrier will have no effect on every plane that flies. So, out of an abundance of caution, the lawyers have advised the insurance companies who in turn require the airlines to maintain the policy, even though there is no way to check every passenger and their purses, pockets, luggage and every place a cell phone may be in a plane that has not been turned off or put in silent mode. The second reason/theory actually dates back to the earliest days when some planes had phones installed on planes and would charge very high fees to use.