Check Your iPhone 4’s Antenna Reception With Field Test Mode In iOS 4.1

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11 September 2010
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Now you can put your iPhone into field test mode, which will allow to easily and precisely test your cell signal reception quality. You just need to follow these two easy steps:

  • First, upgrade your iPhone 4—or any iPhone—to iOS 4.1
  • Dial *3001#12345#* into your phone

— via Gizmodo

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