Please follow the instructions based on your device:
[iPhone]
Settings > Mobile Data > Mobile Data Network > Enter the APN, Username, and Password under “Internet Tethering” → Return to Settings and enable “Personal Hotspot”
iPad:
Settings > Mobile Data > APN Settings (or Mobile Data Network) > Enter the APN, Username, and Password under “Internet Tethering” → Return to Settings and enable “Personal Hotspot”
[Android]
Settings > Network & Internet (or Connections) > Tethering (or Mobile Hotspot) > Enable “Wi-Fi Tethering”
・On some models, you may need to add a separate tethering APN under “Mobile Network” > “Access Point Names”
・Note: Tethering may not be available on all devices or plans.