MicroSD is more or less the same. CF cards are the only memory I know of that have 1TB capability and will leave a VERY deep hole in your pocket. They are used for shooting uncompressed 4K on high end Sony, Red Epic and other professional cinema cameras. They aren't available to the average consumer.
If you can get a 2TB microSD card, it'd be brilliantly expensive. Might be worth the price-tag if you were thinking of spending weeks or months with your LG G5 in places where you wouldn't get cellular network (forest/jungle/desert/sea/polar caps/etc.). Then you'd have plenty of storage for multimedia.
Otherwise, back-up multimedia to an external harddrive via a computer, or store it on the cloud would be my suggestions.