Unlocking an iphone 4 with ios 7.1.2?

So my boyfriend just recebtly gave me his old iphone 4. The problem is, its locked to a network i don't intend to use. The network won't unlock our phone and i was wondering if anyone knew of a FREE way to unlock it? (With a software i guess) its firmware is 04.12.09, and its locked to Meo (TMN), which is a portuguese network (i'm in portugal). If there's anything else you need ill bereplying in the comments!

Free? Not likely going to happen.
Pay? Very likely. Chronic Unlocks maybe able to help

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