I'm upgrading from a Series 3. I purchased a Series 4 from Costco and Best Buy. Both will not activate on Verizon. Tried upgrade tips on this forum such as making sure I select remove cellular plan on the watch app and selecting restore. Also tried keeping plan and setting up as new. Unpaired and repaired countless times. The app will always show under the Cellular setting that the Verizon plan is not in use. The watch itself will show no cellular plan. I went to a Verizon corporate store and he couldn't set it up as well. He called support and then told him only watches purchased from Apple or Verizon could be activated. So, it appears if the watch is not in Verizon's database, it's a no go. Does anyone have the number to Verizon support that can help me to add the watch to their database so I can activate cellular?