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If your Nokia N73 says Invalid Sim means it may locked to some network.You need to unlock it.You can get the unlock code from the site Classicunlocking.com and Unlock Nokia N73 then use with any GSM Network Sim card...You can use any GSM Network Sim card after Unlock it.You cannot unlock CDMA Network locked Phones,Only GSM Network Locked Phones can be unlocked.
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