How to unblock an iphone 4s?

I just bought a used iPhone 4s and apparently it's been blocked. I paid £250 and feel like iv been totally shafted. I wasn't aware of the imei numbers that networks use to block phones. Can anyone recommend how I can minimize my losses. Can the phone be unblocked or maybe used in India?

Unfortunately, once a phone has been blocked,
It can't be unblocked…

Sorry mate

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