What do three short beeps mean when calling a lost iPhone 13 at CLT?

Hello Friends,

I lost my iPhone 13 (work phone, carrier: T-Mobile) on March 27, 2025, at Charlotte Douglas International Airport (CLT) — specifically Concourse A, first floor, in the seating area between gates A22 and A25. I’m 90% sure I left it in a chair during a layover.

Here’s what’s strange:

• About one hour after realizing it was missing, I called the phone and it rang normally and went to voicemail.

• Now (24+ hours later) when I call it, it just gives three short beeps and then disconnects — no ringing, no voicemail.

Does this mean someone shut it off or removed the SIM? Or could it be in airplane mode on a flight still?

Other notes:

• I already submitted lost and found reports with American Airlines and CLT Airport.

• I cannot log into iCloud to track it because I don’t remember the iCloud password for the work phone, though I do know the iCloud email.

• I tried resetting the password using my personal iPhone and I’m currently waiting for Apple to respond.

Any advice on what those beeps mean or next steps would be huge. Thanks.

[Re-Titled by Moderator]