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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/
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).
Your sim might be damaged contact your service provider to get a new duplicate sim Or your N73 were network locked please goto this site to get unloack code and instructions http://www.unlockallcellular.com ,Thanks