This gets asked every few months but nothing has ever changed.
Ask 48 support in case there's something in the pipeline but I doubt it or we probably would have heard already.
Post back if you get an answer from them.
This was asked yesterday and this is the reply from 48 support:
Hope this helps.
No - 48 still don't provide 4G/LTE and unfortunately there's still no word about if/when they will.