I bought a refurbished Xiaomi Redmi Mi 4i Duos phone on ebay. Unfortunately, when I tried it out, I found that I was not getting coverage indoors. Checking signal levels, found that 3G and 4G signal levels were OK, but the new phone was having a 20dB loss in signal for 2G signals. Ebay made the seller accept the item back, and refunded me (though I would have preferred a replacement.)
Edit - added the screenshot of an Mi3 at the same location, with better signal, below. -81 dBm as against -101 dBm for the refurbished phone above. 20 dB greater.
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