Why does 4G need to turn off when the device is connected to a Wi-Fi network?

Cristián Torres-Gluck Balmaceda June 7, 2013
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I was wondering why 4G needs to automatically disable when the device in question is connected to a Wi-Fi network. I was wondering in part out of curiosity, but also wondering if it’s for some commercial reason (i.e. for the developers/manufacturers to somehow make more money), or if it will damage the device to have both active at the same time.

As long as it doesn’t damage the device or any of its infrastructure, and if there is some benefit of doing so if at all, I would like to find out how to activate both 4G and Wi-Fi at the same time.

Device: Samsung Galaxy S III
Carrier: Verizon Wireless
Operating System: Android 4.1.2

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