Oppo N3 Network Problem No Service Solution

Oppo N3 Network Problem Oppo Mobile M3 No Service problem solution. oppo mobilr\e some time network work but some time only no service.

fist of all check sim and then check network setting all ok but network not working, then check   SKY7621 ic is a Schottky diode with a rectifier, used in conjunction with SKY77629-21. re-ball this filter or change.