My iPhone says "iPhone unavailable"

It's too late to use your passcode, you now need to reset your phone -

If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -

Click on the link for instructions on how to reset your passcode without a computer if you have iOS 15.2 or higher.

If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support

Click on the link for instructions on how to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support

You won't lose anything. Just reset and then restore from your backup.

You do backup your "vital" data, don't you? If not, I guess it's really not that vital to you.

It is so easy, I do it in my sleep (automatic backup).

One more bit of advice, be sure to lock your phone before putting it in your pocket. Then you won't attempt to unlock it accidently (similar to butt dialing) and encounter this situation.

imdaadur-rahman wrote:

If my own finger print, pascode and icloud cannot help me to recover my device from Unavailable mode and the only option is to erase and loose my iphone's vital data, then I wonder which kind of security iphone is providing us with.

Apple is providing you with very good security. This feature keeps others from seeing your data. If you don't backup your data regularly, then it is your fault that you lost vital data.

You are welcome to choose whatever phone suits your needs the best.