Statement:
In American Samoa, mobile Internet is on average more expensive than in Vietnam

In the Most expensive mobile internet rating American Samoa holds position #69 ²⁰²² out of 204 and Vietnam is #133 out of 204 ²⁰²².
Position of American Samoa is worse than position of Vietnam.
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 Vietnam, 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
   Vietnam	'Average price of 1GB (USD)' value is	0.61