Are all LTE devices applicable to all 4G bands of different network operators?

We recommend you to confirm if 4G bands provided by your operator applicable to your device before you purchase the phone.
Take 700 MHZ for example, it has many bands, such as Band13、Band14、Band17、Band28、Band29、Band44.
The operator TaiwanMobile uses Band28, so your device is only workable when it supports Band28 of 700MHZ.