I ordered my first eSIM over the phone, it was delivered with my phone number on the sticker, but had not been activated so my physical sim worked up until I swapped it on the website. I read on another post that the QR code could be rescanned on the same device to add it back onto the phone. I wanted to test this and just so every one knows, the QR code can only be used once. I had removed the plan, and immediately tried to scan it back on but it would not allow this. I had to go into my EE store, who didn't know what they were doing, but found the "How To" guide that I'm guessing EE HQ had sent them. He activated it for me then and there and I was back up and running.