Secret iPhone codes simplify troubleshooting
Last fall, we told you about Apple's iPhone Signal Strength Placebo, an iPhone code that helps diagnose problems connecting to AT&T's 3G network. Dialing *3001#123456#* and pressing "Call" starts a field test on your iPhone with results that can be used, for example, to gauge signal strength. (It also offers a slew of other information probably beyond your comprehension unless you happen to be a cellular engineer.)
While the above code above is the iPhone's most useful, there are a number of other interesting codes, many posted at methodshop.com. According to … Read more