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

In the Most expensive mobile internet rating Tonga holds position #105 ²⁰²² out of 204 and American Samoa is #69 out of 204 ²⁰²².
Position of Tonga is better than position of American Samoa.
Both countries holds average positions in the "Most expensive mobile internet" rating. So Average price of 1GB (USD) is an average for both Tonga and American Samoa, 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
   Tonga	'Average price of 1GB (USD)' value is	1.19