We didn’t bother with Bluetooth connection we just use a HDMI Adapter for Phone/Pad, pple HDMI Adaptor,1080P Digital AV HDMI Cable Adapter with Charging Port,Sync Screen HDMI Connector for OS 11 and Before[Need power supply] HDMI Adapter for Phone/Pad, pple HDMI Adaptor,1080P: Amazon.co.uk: Electronics
Make sure your phone is fully charged and you don’t need a power supply
I use a devise on my Windows phone (also works with windows laptop), I'm struggling to remember if it uses wifi or Bluetooth, it displays the phone/laptop screen on tv whilst still leaving usb on phone open so you can charge, if I remember when I get home I'll look to see if it's compatible with other systems.
Get a Firestick or a Roku stick then connect to your phone using its mobile hotspot function. That's what we used to do with my iPhone before we got a mifi router.
I use a fire stick with the Air Receiver app. This works great with all Apple devices.
We use the official apple adapter and an hdmi cable.
Make sure the app you want to stream from allows hdmi out as sky and bt used to disable this option.
And be aware if you cut corners and buy a non-Apple adapter to save a few bob it probably won’t work after the next IOS software update...where as the Apple one does.