Is there anyway to unblock an IMEI number?

Some more information:
I bought the phone off of craigslist, it is an iPhone 5S, my network is T-Mobile, and it says it's stolen when I check the IMEI number on T-Mobile's website.

Added (1). It worked for a few months until recently

Nope, your sol. I suggest throwing it out or offering to return it to a store. If it was stolen is was actually a crime to buy it even if you didn't know it.

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