Activating another iPhone 8+

[brgjoe]

I have a new to me iPhone 8+. I want to use it on a prepaid plan for now (AT&T). Basically I want to try out new carriers to see which will work best for me in my area.

Anyway, it is a new iPhone 8+, waiting to be activated. I bought a prepaid AT&T SIM as well. Should I put the new SIM card in first and activate it when I activate the new iPhone? Or should I just activate the SIM first, then put it in the new iPhone and then activate the new iPhone?

Never have tried this before and want to know the proper way to go about this. I will be using the same Apple ID, btw (or at least I intend to).

Thanks!

 

[Audit13]

You can use any supported sim, active or not, to activate. I've done this numerous times when buying used iPhones.