I have an s10+ and a Galaxy watch both on ee and I rang them and asked for my bill to be on different days, phone and watch separate, since then I can't see the data usage of my phone on the app.
Welcome to the community.
It sounds like the two devices may now be on different accounts.
I'd recommend getting back in touch with our Customer Care team and letting them know what's going on.
One of these options may help you find the answers you need.
Start a topic
Join the EE Community to ask, answer, learn and share.