Beste antwoord door Hajar
T-Mobile will offer the Apple Watch Series 3 WiFi version with the launch of Apple Watch series 3. However, we will not be offering the E-sim card version yet. In 2018 we will have more information regarding the E-sim card version. I understand it might be tempting to purchase one in another country such as the USA, but it won't work. Series 3 models appear to be limited to connectivity in their original country of purchase.
If you have any questions, please let me know!