I will upgrade my phone (old Nexus5 to a newer Pixel phone). What should I know/do ?

I already have a fizz plan/account with my old phone.
Do I need to order a new SimCard or can I just transfer it from my old phone to the other ?
If I need to order a new SimCard, what happen to my account, I will have all transferred to my new phone (phone number, etc...) ?
Do I need to close my other plan and recreate a new one, new user ?


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