If embedded SIMs (eSIM) are the future, we'll have to walk on a rocky road to get there - many EE subscribers are reporting that their Apple Watch Series 3 is failing to connect to the network. This seems to be an EE issue rather than something Apple messed up, but it hasn't been a smooth launch either way. Users are typically faced with one of several errors including: "activation failed" and "this account is not ready to use with Apple Watch". If you're experiencing issues activating your LTE-enabled Series 3 watch, you can dial 150 for help - EE has trained personnel standing...
Source: https://www.gsmarena.com/ee_troubles_with_apple_watch_series_3-news-27539.php
