When I arrived Taiwan Taoyuan Airport terminal 1 two weeks ago, I purchased a 10-day prepaid sim card that came with unlimited data and TWD100 worth of call charges for local or oversea calls. It cost TWD500 which is about SGD21 for 10 days, quite reasonable. Incoming call is free.
There are 3 telco counters namely Chunghwa Telecom (中华电信), TaiwanMobile (台湾大哥大) and Far Eastone (远传) on the right side after exiting the departure hall. Their packages are quite competitive, so I chose Chunghwa Telecom simply because it is the oldest and supposed to have the widest coverage.
True enough, the coverage is so good that I could still access internet in Taroko National Park located in remote central Taiwan. The speed is also faster than what I experience with my Starhub 3G broadband in Singapore.
Yes, personal hotspot or tethering is allowed, so with this package, my iPhone became a wireless router for my family members' mobile devices. Everyone was connected to the world!
I am like you. I like to buy these prepaid sim cards wherever I go for a holiday. I was in Hong Kong recently and I bought the one2free HK$78 per week unlimited mobile broadband sim card. Works out to be only about S$13.
Usually, I end up buying separate sim cards for my teenage kids as well... given that the internet is much more important to them than to me! Actually, my main reason is to ensure that they do not get lost and I am able to contact them anytime.
When I reach the hotel room, I will then insert the SIM card into a portable wifi device so that I can surf the internet using my netbook and tablets. I will then hook up the netbook to the hotel TV to stream Starhub channels to the TV. I have both Slingbox and Vulkano at home and these will allow me to control and stream Starhub channels from my house. One acts as a backup! Yes, I even have a portable digital to analogue TV signal converter in case the hotel TV is an older one. This way, we feel very much at home anywhere in the world.