Symmetric Engineering Group

By DAVID POGUE

The statistics on distracted driving are pretty scary. Just making cellphone calls increases your chances of crashing by four times; sending text messages increases the risk 23 times.

We know this, we get this, but we keep doing it. About half of all teenagers admit to texting while driving, for example, no matter how many statistics and horror stories we pass along to them.

If you’re a concerned parent or employer, therefore, you may want to consider fighting technology with technology. There’s a new category of cellphone apps made just for this purpose: text blockers like iZup, tXtBlocker, CellSafety and ZoomSafer. When your car is in motion, they lock up your phone so you can’t text, call, e-mail or surf the Web.

How do they know when you’re driving? They rely on your phone’s GPS to calculate your speed. If it’s more than five or 10 miles an hour, it’s pretty clear that you’re no longer walking. (You could be riding your bicycle, of course. But come to think of it, that’s probably not a great time to be texting, either.)

You’ll know when the software is in effect: your screen is covered by a “MESSAGES BLOCKED” screen. Incoming calls go directly to voice mail; incoming text messages don’t appear until you stop driving.

They all let you dial 911, and they all let you set up certain phone numbers in advance (like your parents’) that work even when everything else is blocked. But otherwise, you quickly realize that you’re wasting your time trying to bypass the blockade, and you focus on getting where you’re going so you can get back to your phone. Which, of course, is the whole idea.

The four apps are very similar — they all drain your battery faster, they all take a couple of minutes to “notice” that you’re moving. But there are some differences, in features, philosophy and the Passenger Problem. (Which is, How can I bypass the block if I’m not the one driving?)

TXTBLOCKER If you, O parent, were born with a dominant Big Brother gene, this is the app for you. It prevents texting, calling, e-mailing or Web surfing when the phone is in motion. It also lets you pinpoint the phone’s location on a map online, so you can track your child’s comings and goings.

You can set it up so that you get a text message every time the phone’s owner exceeds, say, 65 miles an hour. (An unlimited texting plan might be useful.)

You can also define a “no phone” zone, like your young hellion’s school; the phone stops working inside this area.

As for the Passenger Problem, you can temporarily unblock the phone by solving a timed puzzle.

In the blessing/curse department, note that tXtBlocker “pings” your phone’s GPS only once every several minutes. As a result, it’s slow to block and unblock the phone — but it doesn’t burn through your phone’s battery as fast as its rivals. (Price: $25, plus $10 a month or $100 a year; family plan available; for BlackBerry and Windows Mobile. Android and iPhone versions coming soon.)

CELLSAFETY This app blocks everything bad — text, e-mail, Web, chat, Facebook — except actual phone calls. Weird.

Like tXtBlocker, CellSafety offers location tracking and speed monitoring features, and lets you define certain geographic zones. When your teenager enters or exits that area, you’re notified by text message, and, at your option, no texting is allowed. CellSafety also blocks pornographic Web sites.

The Passenger Problem: if you click Request Permission on the blockade screen, your parent or boss gets a text message. If your overlord approves of your request by replying with “unblock,” you can use the phone. (Price: $10 a month, on Android, BlackBerry and Nokia phones.)

IZUP If CellSafety is a friendly babysitter, iZup is the distraction Nazi. Once you’re in motion, iZup turns your phone into a brick. You don’t have access to a single feature (except one single designated app, intended for your GPS navigation program).

“IZUP does not allow a user to select some distractions and stop others,” says the company. “We believe that is key in the fight against distracted driving. We are purists in our approach here.”

You can’t even whip out your phone at a red light or stop sign; to guard against that sort of sneakiness, iZup doesn’t reactivate for several minutes after you stop.

You can’t make any calls except to 911 or one of three preapproved phone numbers. Only the parent or boss can unlock the blocking — by entering a password before you start to drive. If you’re a passenger, tough rocks.

One more note: maybe these apps are young, or maybe the technology gods had a rough week — but in my testing, three of the four apps stopped working at one point or another. TXtBlocker, CellSafety and ZoomSafer each worked intermittently until company reps walked me through reinstalling them. Only iZup worked every time, all the time, solid as a rock.(Price: $5 a month or $50 a year; family plan available; BlackBerry, some Android, LG and Samsung phones.)

ZOOMSAFER When ZoomSafer kicks in, the phone makes a little sound. You can replace that sound with one you’ve recorded yourself; your toddler saying, “Stay alive, mommy!” or “Come home soon, daddy!” makes a particularly effective choice.

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