When you are talking of international standards, then I would refer you something to read about.
https://www.newamerica.org/oti/an-international-comparison-of-cell-phone-plans-and-prices/
Further here are few excerpt for you if you are not interested in reading this long report....
Key Findings: Across postpaid and prep air voice plans, Canada, U.S., U.K. and Japan mostly fall in the high to middle price tiers while India, Hong Kong and Sweden fall in the low price tier.
India and Sweden charge only by usage and cost $0.01 per minute and $0.04 per minute respectively.
In the case of prepaid voice plans, while Canada, Japan and the United Kingdom are in the highest price tier among the countries surveyed, with costs of $0.37 to $0.38 per minute. The United States is in the middle price tier at $0.25 per minute. This is much higher than the rates in countries such as India, Hong Kong, and Sweden, where pricing is $0.01/minute, $0.02/minute, and $0.04/minute respectively. Customers in South Korea ($0.09), Finland ($0.10), Taiwan ($0.12) and Denmark ($0.17) also enjoy relatively cheap rates for prepaid voice service.
For postpaid text plans, the U.K. provides the most expensive plan at $7.70 for 75 texts per month ($0.10/per text) with the U.S. following a close second at $5.00 for 200 texts per month (or $5.00 for 100 texts sent). Japan charges only $0.003 per text sent while both India and South Korea charge $0.01 per text sent.
Only five of the eleven countries surveyed offered unlimited text plans, namely, Canada, Denmark, India, Sweden and the United States. India offers the cheapest unlimited text plan $2.00 per month, followed by Sweden at $11.00 per month, Denmark at $14.00 per month and Canada at $14.59 per month. The U.S. price points are noticeably higher at rates of up to $20 per month.
In the case of prepaid text plans, India offers the cheapest available rate at $0.01 per text, followed by South Korea at $0.02 per text, and Denmark at $0.03 per text, whereas the U.S. and the U.K. have much expensive rates of $0.20 and $0.15 per text respectively.
However, the U.S. rate is several times more expensive than India at $2.10 for 5120MB ($0.0004/MB).
There are more to read about in the article. Please take some time out of your busy schedule to read it as its a long article. Hope I am able to put across my point as afar as your international comparison is concerned.