Samsung watch 3 -Add mobile data

[Estied76]

I've just swapped my phone sim, to an e-sim.

I'm told (by O2) that I can now add that same plan to my samsung Watch3 - so that I can leave my phone at home, and my watch will recieve calls etc from my network provider, using my existing pay monthly plan.

I've tried to add the mobile plan. I get the error message:

"Your mobile plan is not yet set up. Please contact your service provider" error code 118

I can use my mobile data on my phone fine, using the esim. Can anyone help?

I have the Anytime monthly plan, so I believe I can use this on any device?

[MI5 · Accepted solution]

@Estied76 

You need to go in store to activate the esim for the watch and apply the data plan.

It costs an extra £5 per month for this.