Wireless plan issue

Hi
I’m hoping you can clarify something. I purchased Teracube Thrive phones for my kids, but they cannot be used at all unless a $40/month wireless plan is activated per child. The phones haven’t been used yet, and a wireless plan isn’t needed for our purpose. Is there a way to deactivate or use the phones without activating the plan? If not, please let me know the best next steps. Thank you