AT&T signed up half a million cars to its 4G network between July and September, the result of deals with Audi and General Motors to connect cars and offer in-vehicle hotspots for riders.

The carrier began offering 4G service for GM vehicles in June, with pricing beginning at $5 per month for 200MB of data.

For that, the carrier estimates users can stream about 6.5 hours of music, 13 hours of web surfing or thousands of emails. Prices rise to $50 per month for up to 5GB, and one-off daily data passes are also available.

The GM service is offered through its OnStar subsidiary. The 4G signal is delivered to passengers via a WiFi hotspot that can support up to seven devices, according to the auto maker. The hotspot extends a short distance beyond the vehicle so that passengers can access it when the car is parked and they’re nearby.

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