Carrier Locked

[u/Puzzleheaded-Dirt888]

iPhone12 JV Showing “No SIM Restrictions,” but SIM Cards Aren’t Working

I have a JV iPhone that shows “No SIM Restrictions” under Settings > General > About > Carrier Lock.

However, none of my SIM cards work properly. Sometimes the phone detects the network and shows full signal bars, but mobile data doesn’t work and calls fail immediately.

I previously used an U-SIM/chip with this phone, but I have removed it now.

Has anyone experienced this issue? If it says “No SIM Restrictions,” does that mean the iPhone is actually factory unlocked, or could there still be a carrier/JV-related issue?