If the Phone says Invalid Sim means it locked to Network You need to Unlock it,you can Unlock it from Network Lock using the unlock code,You need to specify the brand ,model,find the Network and Country it locked now?GSM Network Locked Phones can be Unlocked,CDMA Cannot be unlocked,To Unlock it use the code,you can get the code and instructions at here
Cassicunlocking.com and unlock it,then use with any GSM Network Sim card in the Phone,It says Sim missing means You can better go to nearest store to fix,Because it may be hardware Problem....
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