Statement:
In American Samoa, mobile Internet is on average less expensive than in The Gambia

In the Most expensive mobile internet rating American Samoa holds position #69 ²⁰²² out of 204 and The Gambia is #34 out of 204 ²⁰²².
Position of American Samoa is better than position of The Gambia.
Both countries holds average positions in the "Most expensive mobile internet" rating. So Average price of 1GB (USD) is an average for both American Samoa and The Gambia, compared to most countries of the World.

Referencies:

1. Most expensive mobile internet ²⁰²² by cable.co.uk

   The countries in the rating sorted by 'Average price of 1GB (USD)' in descending order.

   American Samoa	'Average price of 1GB (USD)' value is	2.33
   The Gambia	'Average price of 1GB (USD)' value is	4.60