How can I unlock old broken screen Republic Moto G phone (which she replaced) for use in Mexico?

is it as simple as plugging in new SIM card?

Moto G third gen phone.

the Republic version of the Moto G 3rd can not be used on any other network due to the custom ROM modified for the Hybrid VOIP/Cell network to work with android 5.1 so it will not be able to be used in with an Mexican Carrier

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