Galaxy S4 I9500 sim insert problem can be solved with easy method. Trace each point on motherboard related to sim jackets and apply jumper on any missing point. Some time this problem creates due to Sim IC, resold sim ic or change it. Here in diagram all points are traced, follow the diagram and make jumpers like diagram below. Only apply jumper on missing point not all points.

Galaxy S4 I9500 Sim 1 Full Ways Jumpers Diagram
samsung s4 insert sim solution diagram
Samsung s4 insert sim problem solution with diagram all points are traced and marked with color lines.

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