How to unlock my iphone 5 carrier?

My uncle just gifted me an iphone 5 and he bought it in france. Bringing it in Mauritius(where I live) and when I put my sim card in it, it can't be activated and shows me the following message:
"The SIM card inserted in this iPhone does not appear to be supported.
The SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information."

This is actually annoying and I need help As soon as possible… Thank you in advance <3

You can unlock your iPhone's carrier after you do jailbreak on it. I found a software on the web that allows you to jailbreak your phone, there's also an explanation that comes with the software as to how it is used.

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