What is the logic?
Using Chunghua Telecom it costs nearly twice as much, if not more, to call the Philippines and Thailand as it does to call North America. North American workers generally earn a lot more than Thai and Filipino resident workers in Taiwan. Both Thailand and the Philippines are a lot closer geographically than North America. I doubt there are more North Americans here in Taiwan than Thais and Filipinos put together.
I realise costs of calls using the local Telecom to South Africa are just plain outrageous.
If this has been done before ,sorry but I did search for both Chunghua Searching for Telecom brought up 18 pages. I think I’ve seen the company name using every vowel after h apart from i and e.