1Download the APN configuration file from this link.

Link : https://seikou-tt.jp/ios_sim_vang_6

2Go to the settings screen, select “General ” then select “Profiles”。

3The profile settings screen will be output, so select “Sim Vang APN 3” and “Settings” in the upper right。

4Select “Next” in the upper right。

5A warning will appear, but please select “Install” regardless。

6A pop-up screen will be displayed, so select “Install” to complete the installation。

7Select “Done” at the top right of the screen。

8Restart device。

After restart device, settings and communication SIM card will be recognized correctly。