Nokia Lumia 900,Nokia problems

How to Solve Nokia Lumia 900 SIM Card Problem?

How to Solve Nokia Lumia 900 SIM Card Problem?


  • Insert SIM card error.
  • Phone book inaccessible.


  • Jumper wire.
  • Soldering Gun.
  • Heat Gun / Heat Blower.
  • Multi-meter.


  • Restart your phone.
  • Remove, clean and re-insert your SIM card.
  • Check with any other SIM card.

Reasons for Problems

  • It might be due to dust on SIM Jacket contacts.
  • SIM power line might be faulty, if it happens then it doesn’t show SIM card.
  • It might be due to faulty capacitors. They are total 4 in numbers, if any one of them is faulty then it will affect your overall SIM card function.
  • Issue might also be due to SIM card IC.

Hardware Procedure

lumia 900 sim card problem

  • Clean SIM jacket contacts and check.
  • Check all 4 capacitors with the help of a multi-meter, if any of them is faulty replace it.
  • Check SIM Power line with Capacitor -1. Place jumper if connections is faulty.
  • Now check connection between 1st pin if SIM jacket contact with Capacitor – 4.
  • Check connection between 5th Contact of SIM Jacket with Capacitor – 2.
  • Check connection between 4th Contact and Capacitor – 3.
  • If everything else fails then gently heat SIM Card IC, if that method doesn’t work then Re-ball or replace IC.


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