According to All Things D, T-Mobile USA is preparing to launch a new app and service that seeks to make driving safer for customers. The Drive Smart Plus app will manage the user’s phone automatically in order to turn off many voice and SMS features. If a Bluetooth device is attached, the app can send calls there by default. SMS messages will be auto-replied to with a notice that the user is driving. The key here is the automatic part. Drive Smart Plus will turn itself on when it believes the user is driving. 

The apps and service will be opt-in, and at first it will only be available on the LG Optimus T, but other phones are in the works. It will cost subscribers $4.99 per month for the Drive Safe Plus service, but a free Drive Plus Basic app will be available. The key difference is that users must manually activate the blocking features of the basic app.

The Drive Safe initiative is based on technology from Location Labs. We imagine it tracks GPS much as Google Latitude does, and takes note of acceleration on roads to switch on the app. That means GPS-related battery use, and another thing to run in the background. Will users want to deal with the possible issues, and fees? Let us know if you’d be in.

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