Help Whatsapp backup and restore problems

[spman]

Q1. How to temporary prevent new sms, new whatsapp, new incoming calls while I am downloading/restoring sms, whatsapp backup?

Q2. I have remove my sim card from old phone, put in my sim card into new phone, and setup whatsapp and restore whatsapp in my new phone. In my old phone I tap the whatsapp button and I see the "welcome to whatsapp" screen (screenshot https://i.imgur.com/lwPvJQk.png ) that is not logged in and not setup, how do I completely remove whatsapp history/files/info left in my old phone?

Q3. I received a sms that says [Your WhatsApp code: 123-456, you can also tap on this link to verify your phone: v.whatsapp.com/123456] after I install whatapp, I was not asked to enter the whatsapp code anywhere, where should I enter the code? Should I click the link? (I am not sure is it safe to click the link) (note: 123456 is an example, not the real code)

Thanks

 

[Hadron]

Q1: airplane mode. If you need to use WiFi to download then you can turn it on in airplane mode, but if WhatsApp is active there would then be the possibility of new messages coming in.

Q2: go into settings, apps, find WhatsApp, clear storage for the app. Then use your favourite file browser and erase the WhatsApp folder from your internal storage (or SD if it's there instead - it's been so long since I used a phone with an SD card that I don't know whether WhatsApp allows you to move that folder there).

Q3: it's been a long time, so I don't remember, but this sounds like what's described here: https://faq.whatsapp.com/en/android/20970873/