Dear sir I bought my iPhone 4 from Apple store in Charlotte N/C about 2years ago without contract. Now I tried to upgrade it to iOS 7.0.4.but after that my phone not work with last sim card. And invalid sim appeared.so I bought it without contract but it

Dear sir
I bought my iPhone 4 from Apple store in Charlotte N/C about 2years ago without contract.
Now I tried to upgrade it to iOS 7.0.4.but after that my phone not work with last sim card.
And invalid sim appeared.so I bought it without contract but it seems to be lock in my country
Please tell me whats the matter?
My phone serial no  86034HTCA4T
Modem firmware  04.12.09
Thanks
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Reply

Without contract is not the same as unlocked. The update to iOS 7 relocked
the iPhone to the wireless carrier to which it was originally locked. You must
contact that wireless carrier to see if they offer unlocking and if you qualify.
If you used jailbreak or other hack to unlock the iPhone initially, the method
used may prevent a legitimate unlock from succeeding and may render your
iPhone unuseable.