Changing Moto X 1st gen sim card for use abroad

Hi everyone! So I will be going abroad to Spain for four months and I was wondering if I would be able to switch the sim card in my Moto X 1st gen for another sim card that will work while I am there. How do I go about doing this? Thank you for your help!

Not doable with the Republic Moto X 1st Gen (or any of The Republic 1.0/2.0 Phones due to the Custom ROM makeing the incompatible with other carriers)

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