My first and only phone, HTC One M7, which is over 5 years old cannot be salvaged anymore. I'm planning to get a new one, and my choice is Mi8.

I've never bought gadgets online. What's your experience buying phones from Lazada? I'll be buying from their official store on Lazada, but what are the first few things I need to check immediately once the phone arrives?

Also, my SIM card in my old phone is microSIM, which won't fit in Mi8. Do I need to get a new SIM card? Sorry if my questions are silly, I'm not a techie.