How to check a genuine iPhone?

[shoeb]

What is the authentic way to get to know the following?
1. Inactive or active
2. If active, activation date
3. GSMA blacklist status
4. iCloud locked/unlocked
6. Stolen, lost status

 

[J. A.]

Welcome to iPhone Forums!

In many countries, cellular carriers have blacklists. To find out whether or not a phone you intend to buy is blacklisted, you need it’s IMEI number. That number can be found i Settings - General - About on the device.

Make sure that the iPhone isn’t connected to an Apple ID: Can I Unlock My Device From a Previous Owner's Apple ID? - macReports

Here’s how you can find out whether or not an iPhone is locked to a carrier: How To Know If An iPhone Is Unlocked or Locked - macReports

Maybe you can also get the original receipt for the iPhone. If you need Apple to unlock your device, it’s necessary to prove that you’re the owner.

Here’s some more good advice: 17 Things to Check When Buying a Used iPhone Online/Offline
Hope that helps.