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how to put the Apple iPhone in Field Mode

As the dust raised by the problem of antenna on 'iPhone 4G. There will be handy to know how to put the device in Mode Field to see all the network settings and make your private tests with the models available.

• Select Phone icon.
• Open the keypad and type * 3001 # 12345 # * more green call button.

• To exit, simply press the Home button

You can not save the number as a contact but you can save it on a note and use the copy-paste to put it on the keypad and start the application quickly without having to retype all the numbers every time.
Important works without Jailbreak.

Thanks to Stephen for the tip.