Nokia n73 sim card not valid problem but when remove SIM it works propely and the SIM works ok in any other mobile finally when put any other SIM gives the same error sim card not valid

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/

My dear:
This error usually occurs when you attempt to use a SIM card from a network other than the network from which the phone originated (e.g. your Nokia mobile phone originated from Orange UK and displays the 'Sim Card Not Valid' error when you attempt to use a T-Mobile UK SIM card). The 'Sim Card Not Valid' error usually means the phone has been restricted for use on one specific network and you would need to unlock the phone before alternative network SIM cards can be used.

could You test the new SIM on another phone? Could be the housing of SIM damage on phone - hardware problem - Nokia Service.

in any case you need to find out which network and ask them for the unlock code.

Only the original network to which it is locked can provide this code.

Hello

This error usually occurs when you attempt to use a SIM card from a network other than the network from which the phone originated (e.g. your Nokia mobile phone originated from Orange UK and displays the 'Sim Card Not Valid' error when you attempt to use a T-Mobile UK SIM card). The 'Sim Card Not Valid' error usually means the phone has been restricted for use on one specific network and you would need to unlock the phone before alternative network SIM cards can be used.

could You test the new SIM on another phone? Could be the housing of SIM damage on phone - hardware problem - Nokia Service.

in any case you need to find out which network and ask them for the unlock code.

Only the original network to which it is locked can provide this code.

To get the security code/restriction code to unlock the cell phone from the current cell phone provider so you can use it with a different phone provider, Please click on this link and follow my instructions :-

http://www.fixya.com/support/r4049238-unlock_cell_phone

If your phone provider does not help you then this WEB site it provides security codes for a small price.

http://www.mobileunlockstore.com/?gclid=CKDb2_y2558CFSlJagodxBkDHw

Try this WEB site also - Unlock Free

http://www.unlock-free.com

If you cannot find your model cell phone on these WEB sites, then the security code/restriction code is not available for your cell phone at this stage and hopefully will be available in the near future.

sim card not valid in my nokia n73 mobile

Check that sim valid,
Check with another sim card if problem not shows sim card may complaint do as follows
Take the sim crd out and rub gently with a cotton cloth, and reinsert it.
Or take to service provider & ask him to give duplicate sim.
If problem with mobile try to dial *#7370#(Format),
Or take mobile to Nokia care(Problem might be network ic).

it need unlocking

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.

well you have t unlock the phone this can be done online....or take it to a mobile store or mobile tech close to you to hvae the mobile unlock.