Since my iPhone has email and a bunch of other sensitive information on it, I’ve always set a passcode. But I’ve always been a bit dubious about the security of a 4-digit code. In fact, one of my coworkers once saw what I entered as we were walking down the street. While I’m not really worried about coworkers, and 10000 possibilities might be enough given there’s an Erase Data option, I still wanted more security — especially once I get an iPad and may have more data on it.
iPhone Configuration Utility. While this has a wide variety of enterprise options, it’s actually easy to make a simple profile.
Download and install the utility (there’s also a Windows version). Launch it, and click “Configuration Profiles” in the left pane. Click “New” in the toolbar. Enter a name and ID in the “General” section, then click “Passcode.” Now you can set up a more secure passcode — more than 4 characters, letters as well as numbers, etc. (You don’t actually choose the passcode here.)
Now you can set up a passcode as usual, in Settings > General > Passcode Lock.