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If the Phone says invalid Sim card means it locked to some network,You need to Unlock it.....You can Unlock the Phone,using the Unlock code from here Superunlockcodes and Unlock it.Check code for Your network lock and Country and Unlock it.....Then after unlock it you can use any GSM Network Sim card in the Phone,.
Try default codes or master rest codes to reset your security settings ,invalid sim is due to the network lock you na\may contact the service provider if you need to unlock it using codes try here http://www.mobileunlocksolutions.com/
unlock phones are so unperdictable...there may not be a fix for this issue..other then getting an AT&T phone....and even if u are able to get it to start working again more then likely u wil continue to have many more isses..mainly becuz of the network changes..for example....using 3g and 3g only...last year the AT&T network was stil using both 2 and 3g network and there was even a few 2g SIM cards being sold in stores...now it almost all 3g..which of course complicates many things...even if u own a 2g AT&T phone a 3g SIM card can be and will be used on that phone....with unlock phones running on the 2g network the issues with not having a SIM card where possible...it was still unstable when wanting to use data services....but voice services were possible...now with everything going 3g...its makes things alot more complicated with AT&T if using a phone without SIM cards...if ur phone has the fuction to beable to shut off 3g networking and run on 2g.(like the apple iphone has) then try that....good luck
mine done the same, i put the sim into my dads phone and it aksed for a puk code i got a puk code from orange customer services and unlocked the sim using my dads phone when i put it back into my viewty all was fine hope this helps
Debbie invalid usim means its been barred by the network, so whom ever the network provider is for the phone you will have to give them a call and ask them to un barr as you have just brought it. We brought on off ebay at christmas on orange as we're on orange and had the same problem. We called them and they took the barr off straight away, no charge. Jan