Back from vacation in Japan. Ting worked great!
I see some comments about international usages advising we should use phone oversea as if you make a call in the US.
But in Japan, situation is vice versa. We must treat the phone as we are making calls from Japan. Meaning no access code or country code is required when making a call to Japan's phone number.
Calling to US number from Japan is opposite. We need to dial access code (010) and country code (+1 US).
Access code is depending on what network is used in the country we visit. In Japan, ting seems to use NTT DoCoMo network, so access code is 010.
Just drop the lines about my experience.