Carriers are always looking for ways to get you to add more lines, so a line of service for your car? Sure, why not? That's what SyncUP DRIVE from T-Mobile is all about, and today the carrier is making it cheaper to equip multiple cars with its tracking and diagnostic dongle. SyncUP DRIVE now includes as many as 24 cars on a single account at no additional cost.

SyncUP DRIVE is an OBD-II connector that relays data over T-Mobile's LTE network. It also has a built-in WiFi hotspot for use in the car. Using the SyncUP DRIVE app, you can see a car's location and diagnostic data via the SyncUP DRIVE app. T-Mobile notes that expanding the service to 24 vehicles makes it ideal for managing a fleet of vehicles. A single unit is still fine for keeping tabs on a rebellious teenager, though.

You still need to pick up a dongle for each vehicle, but T-Mobile has the hardware on sale right now. It's usually $120, but it's down to $48 or $2 per month. You need to have a 2GB monthly data plan on the dongle to be eligible for the deal. T-Mobile is very keen to point out the expanded car support comes at no additional cost, but it seems like you'll still need data plans for each car. We've reached out to check.

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