1. Dono SIMs ki jagah badal kar dekhein. Jo SIM kaam nahi kar rahi usay pehle slot mein lagayein. Agar pehle slot mein chal jaye to doosra SIM slot kharab hai, SIM nahi.
2. SIM tray aur SIM saaf karein. SIM ke sunehri (golden) hisse par naram eraser ya dry kapra pherein aur tray mein jami mitti nikaal dein. SIM ko tray mein seedha rakhein — terhi SIM contact nahi karti.
3. Doosri SIM ka mobile data/4G setting check karein. Kuch phones mein ek waqt mein sirf ek SIM par 4G chalta hai. Settings > SIM cards mein doosri SIM ke liye "Preferred network" 4G/3G par set karein.
4. Network manually select karein. Settings > Mobile Network > Network operators mein "Automatic" band karke apne network ko manually select karein. Kabhi kabhi phone ghalat tower pakar leta hai.
5. SIM ko doosre phone mein test karein. Agar wahan bhi no service aaye to SIM kharab ya band hai — franchise se nayi SIM nikalwayein (BIOMETRIC verification sath le jayein).
6. Airplane mode on/off karein ya phone restart karein. Network registration atak jaye to is se theek ho jati hai.
7. Agar upar sab fail hon to SIM IC ya SIM slot ke pin kharab ho sakte hain. Warning: SIM tray mein sui ya pin ghusane se andar ke contact pin toot jate hain. Kisi achi repairing shop se check karwayein.
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