I did most of August this year in Japan/Vietnam/Taiwan with the 15gb plan. Very good results in Tokyo/Hanoi/Taipei/Hiroshima. Only 4 days in Vietnam in Hanoi area. Still have two Hanoi speedtest.net download/upload mbps readings .... 4.69/3.33 and 3.57/3.21 both labeled 3g. Very satisfied with results. Only area with less than good results were some remote western Japan areas.....outside Toyama.