A simple way to check is by inserting other network's simcards with the iPhone 4 and if it works without any problem then the iPhone is unlocked...if it shows any error messages like "Invalid sim"or "Error sim" then the phone is locked with a particular network.To remove the network lock you can approach
Onlinegsmunlock.com and remove the network lock permanently using their remote unlock service.If you have any doubt with what network the mobile is locked too...you can use their contact us form to get the respective details.
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