Sim card not valid in n73

There are two possibilities available to get sim card not valid while inserting Sim on your phone.
1.There may be a problem in your Sim card so try another one.
2.Your mobile is locked to particular network provider.
If your problem persists,Your mobile phone is restricted by some network so try to unlock your mobile phone.You can unlock your mobile phone using network unlock code.It's the best way to unlock your phone.If you need an unlock code for your WickedUnlock.com I hope it will be very useful to you.

Is your Nokia N73 locked with any particular network?If so when you try to insert other network sim cards you will get the error "Sim not valid" or "Sim invalid" or "Sim not supported". Try to unlock the mobile.I suggest you can approach Theunlockarena.com and specify the country,locked network.Based on the availability you can get the unlock code along with free instructions.
http://www.theunlockarena.com/nokia-n73/rs13wp9/

The phone is blocked to a certain network. Try unlocking the phone

Try by changing a new SIM and see whether it show SIM not valid or not?

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nokia n73 sim card not valid problem solution system

sim card not valid in my nokia n73 mobile

if its showing that sim card not valid means. your phone has network LOCK on your phone. try to do unlock your phone

1. try to format ur set *#7370*
2.If stilll having problem then go to repair centre. ur ic or pbc may be damaged wont cost u much

this is hard waring problem. it is happen may be ur sim slot has been leakage from circit or sim ic has damaged. for helping plz go 2 tecniciaton and solve the problem

Look, your phone don't recognize the card try to put another card, if it won't help clean the place of the sim card with a tooth brush its probably dirt.