I'm bringing an unlocked iPhone 5 to Taipei and was initially leaning toward Chunghwa, until I saw that their LTE bands are 900, 1800 and 2600 MHz. My iPhone model only supports 700b, 850, and 1900 MHz, I believe (it is ex-AT&T). Would it be better to go with Taiwan Mobile, which seems to offer LTE on 700 and 1800 MHz?

I'm visiting Taipei only for 10 days. I may be back, but it won't be until 2018.