If you are using Lyca Mobile as your phone provider you need to do some extra steps to activate your personal hotspot.
In your iPhone go to Settings >> Mobile >> Mobile Data Options >> Mobile Data Network and in your android open your mobile data settings where you will find APN settings.
Add the following APN under personal hotspot:
Should your internet be slow you can add the same APN settings to Mobile Data and LTE:
If you are still having trouble please contact Lyca Mobile and they can assist you further.