I did these steps below to activate personal hotspot on iPhone 7 on iOS 10.3.1. I use Telkomsel network.

  1. Go to settings > Cellular > Cellular Data Options > Cellular Data Network.
  2. On Personal Hotspot section, write internet on the APN field.
  3. You can see Personal Hotspot is back on Settings.


Thanks to Jacob Hämmerle, adding internet to Personal Hotspot section only works.