Interference from cases with magnetic clips

Knowledge Base article #306435 addresses an issue where magnetic cases may cause inteference with wireless signals transmitted by the iPhone. The document states:

"Remove the phone from the carrying case. Turn iPhone off and then on again. Press and hold the Sleep/Wake button on top of iPhone for a few seconds until a red slider appears, and then slide the slider. Then press and hold the Sleep/Wake button until the Apple logo appears. Use iPhone to verify the issue is no longer present."

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