'能达通,但现在也不能用了,可能倒闭了' are you sure? I used to use Nextel, even since 5 years ago in Singapore. Nextel is not the cheapest, and it only has 10% rebate compared to 20% rebate of other cards. But i think its has high quality/cost ratio.
But i only know stores in chinatown sell it. Stores near my place don't sell it. so i haven't used it for around 1 year.