Unfortunately, Xiaomi phones are GSM only and won't work with CDMA carriers like Visible, Verizon, US Cellular, and the like. I recommend getting a physical SIM card from Mint Mobile or some other GSM MVNO, which will be a cheaper option than AT&T or T-Mobile postpaid. That way, the student can use their same phone and not have to purchase another phone. Good luck to you!
If you have an old phone, you could do the swap for this phone:
The swap would be free if the old phone meets Visible's requirements.