With the LTE-enabled Apple Watch Series 3 only available in a handful of countries at the current time, it might be tempting to purchase one in another country, but it won't work. Series 3 models appear to be limited to connectivity in their original country of purchase.
An Apple support representative who spoke to MacRumors reader Thomas said that an Apple Watch purchased in the U.S. online store will only work with the four carriers in the United States, perhaps due to hardware limitations.
"If you purchased one (an Apple Watch S3 GPS + Cellular) through the US Apple Online Store, it'll only work for the 4 US carriers. It wouldn't work internationally unfortunately. I'm not entirely sure what type of error it would show if you took a US Watch to Germany, but it wouldn't be compatible with Telekom".
Additionally, Apple Watch Series 3 models do not support roaming outside of a provider's network coverage area, according to Apple's fine print, so roaming when traveling to another country is not supported.
Unlike iPhones, Apple Watch Series 3 models also support a limited number of LTE bands, another factor that contributes to no support between countries. In the U.S., Canada, and Puerto Rico, for example, only bands 2, 4, 5, 12, 13, 17, 18, 19, 25, 26, and 41 are supported.
LTE Apple Watch models are currently only available in Australia, Canada, China, France, Germany, Japan, Puerto Rico, Switzerland, the UK, and the United States. Apple says availability will expand to other countries next year.
懒人包：
哪个国家买的LTE版 watch因为硬件限制只能适用于该国的电信商（出国漫游也无法使用）；所以想先去外国买LTE版等台湾支援的可以收手了
来源：http://bit.ly/2xFdxGr

搞不好等到series4都出来了台湾还不支援

好像只有日本的LTE频道有相同，可是怕买回来会锁住只能日本电信能用

NCC之前有跳出来澄清他们法规没有档，那接下来就要看各电信业者愿不愿意做

市场不大 感觉做了回不了本

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原来是esim不是apple sim

do not support roaming outside of aprovider's network这句有问题，4大在美国境内也是很多地方用漫游的

那还不因地制宜调降v(゜Д。)v

所以lte是intel的还是高通芯片？

差点要在日本买了 好险

而且GPS版只有铝框也只有很丑的橡胶表带....又没LTE 一整个大灭火...

所以不只是频段问题，还锁单一电信商？连出国漫游都不行......该不会连NP都不行吧？真的超灭火......

我比较相信是 NCC 扯谎https://i.imgur.com/NtSi7ni.jpg

NCC 说没挡，法规法条内容呢，怎不一并说我google相关讯息，105年还在开会讨论咧

Z

想猜电信商会推出怎样费率XDDDD

其实这回答有点文不对题 美国德国的LTE频段完全无重叠当然美机拿到德国不能用啊....