Mostly a capacity upgrade rather than a speed one — it shines in crowds where 4G stalls. It also drains battery faster, which is why phones drop back to 4G on their own.
The drawing that proves the sentence above. It is the same card that is in the book.
Think of it as
adding lanes and raising the speed limit at once.
For example
At home your phone is quick. In a packed stadium with fifty thousand people, it still works — because the tower can now serve a crowd, not just you.
This is one card out of 275.
The hundred words you meet most are free — the whole set, animated, in one file that works with no internet.
Volume 1 has all 275 in fifteen chapters, with Staying Safe the largest chapter on purpose.