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...
Check for any security updates or other iOS updates you may not have
installed. Download them. Restart your phone againIf you are connected
to VPN, go ahead and disconnect that or any other security softwareIf
you're still having trouble, reach out t...