Which inner part should I replace?
I got S4 and 2G~4G arent working.
Sim has no problem, when I try it on other device, sim works well.
I think this is a problem of one of either sim card slot or the radio, but I am not professional on this so I am unsure on this.
Please give me possible problems on this device and solutions for this.
Is this a good question?
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