Hello Zkaiser94, did you check if the phone is compatible with our network. Please check at the link below:
If it gives you an error message it is not compatible. Please send us a screenshot of the error, also did you purchase the SIM card for that phone?
You would still have to purchase a SIM card for the phone if it's compatible with our network. You can not use the SIM card from another phone. What error did you get when you tried to swap the phone?