PSA: If you’re having issues activating the SIM in your new phone, try putting your Watch in airplane mode and restarting your phone.
Spent a couple hours trying to activate the SIM in my new phone to no avail. Verizon couldn’t figure it out, just saying it could take “up to 2 hours.” After getting disconnected from Verizon support, it occurred to me this might be caused by my cellular Watch. I put it in airplane mode and restarted the phone. Within 3 minutes of being on, the phone was activated.