1. If your iPhone Display Zoom is set to Larger Text, select Default during Cellular activation.
iPhone Settings - Display and Brightness - Default
2. From Visible Support, not verified
“Oh I want to tell you one thing that you can't add a apple watch in the mid of the billing cycle, this is because to keep a sync in between your device and the apple watch. … You can add your Apple Watch during the last two days of the billing cycle”
3. If you can not scroll to the bottom of acceptance screens during activation, try this. Verified. Thank you jsword and Smurfeater.
iPhone Settings - Accessibility - Voice Control. Once setup, a blue microphone icon will appear on top of phone when it is listening. Just say “scroll down” and it will take you to the bottom of the page.
4. To receive SMS, MMS or push notifications from third-party apps on your GPS + Cellular Apple Watch, your paired iPhone must be turned on and connected to a Wi-Fi or mobile data network, but it doesn't need to be nearby. You also need to be signed in to iMessage on your iPhone to use Messages on your watch. Your Apple Watch can process iMessages without the iPhone, just not SMS text messages by itself.
https://support.apple.com/en-au/HT205547 Note#2
5. Moving Apple Watch to a new iPhone
1. Open the Watch app on your current iPhone.
2. Select All Watches, and select the information button to the right of the watch you would like on the new iPhone – this is an i with a circle around it.
3. Select Unpair Watch, and then select Keep cellular plan from the following options: Keep cellular plan, Remove cellular plan, Cancel unpairing
4. Once you have done so, the unpairing Apple Watch will begin.
5. On the new iPhone, pair your watch. Note: The cellular plan is retained through this process and does not require any further steps.
6. Check that service is working on both your Apple Watch and iPhone.
