July 19, 2010March 19, 2015 More secret iPhone codes by happyorright More secret iPhone codes. Most of these codes work. With an iPhone 4 the main secrete code of *3001#12345#* didn’t work. Said an error had occurred. I used this code on friends iPhone 5 and it worked immediately to go into the Field Test mode. Related Posts:Trust me I’m lying Don't you find it amazing that all the time in US society ..Credit card offers from LinkedIn? Has anyone else received credit card offers from LinkedIn? I received one ..Stories from my Past: The high cost of being a ..I worked at a company once that was ok, but had a ..People break what they want to replace A study shows that people break what they want to replace. It ..