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Ask Jerry: What is FCC certification, and why do phones need it?
Let's talk about tech.
If a device has the potential to emit radio signals, like for instance a microwave, it requires something similar known as a Supplier's Declaration of Conformity filed with the FCC. There's no guarantee it will work in your area because of network support, there is no warranty, and buying it is only half the solution; even after the language is set to English or Spanish, much of the phone is still in Mandarin until a different OS is flashed to the device. Imagine the horror of my phone messing with equipment at a hospital or even causing problems with a TV signal or a Citizen's Band radio.
Or read this on Android Central