NO GSM signal: which is the GSM antenna

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Xiaomi Mi 4

The Xiaomi Mi 4 is the fourth generation of the Mi line of smartphones produced by the Xiaomi Technology Company. It comprises of the latest technology that all phone companies have to offer in the world.

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NO GSM signal: which is the GSM antenna

Hi,

using the Xiaomi Mi 4 I have some issue with the GSM signal (no signal at all; the sim card is correctly read by the phone so I don't think it is a matter of internal sim slot contact).

I'm moving my attention to the antenna but... which is the GSM antenna?

See picture HERE