Apple watch not receiving calls and texts since phone upgrade

[Excitingstar16]

I have been using my apple for for nearly a year with no issues (I have a seperate plan for my watch). Last week I upgraded to the iphone 16, but unlike normal, where you put your old sim card in new phone, mine came with an esim. Now I cannot receive calls or texts on my apple watch when I am away from my phone. I can make calls and send texts but I cannot receive them. Also, when my phone is switched off, I cannot use my apple watch at all. Spent hours on the phone to O2 and Apple but got nowhere

[gmarkj]

Sounds like you need to pair the watch with the new phone @Excitingstar16 .

See if this guide helps at all:
Activate Apple Watch Guide 

If not, you will need to contact customer services - try social media first:

Guide: How to find help & contact O2