Tell me my phone activation date

This is a user-to-user forum, we don’t know who your are or what device you are talking about, so we obviously can’t tell you anything about the device.

There is no way to find out the activation date, but if you go to:https://checkcoverage.apple.com/ you can find out when the phone was first sold if it was within the past year.

Sorry, no one here can tell you that.

You can check the warranty coverage at: Check Your Service and Support Coverage - Apple Support