855-950-6645

One  partial ring with  empty voice mail (no message).

Area Code 855 Scam Calls – How It Works [WARNING] - Ibisik
Aug 27, 2024 · Be cautious of calls from the 855 area code that ring briefly and then hang up, only to repeatedly call your number throughout the day. This is part of a widespread one-ring scam.

Joni wrote:

Area Code 855 Scam Calls – How It Works ...

You state "How It Works" and then tell us nothing about how the scam (supposedly) works, just post more vague yet empty blather.
This is an 855 Toll-Free number, dialing it back would not cost you anything as the caller (other than possibly a few minutes that you phone provider would charge you for any call).
If they hand up after a single ring, then there is not enough time to answer, so there is nobody on the other end of the call to try and phish information from you.
This is not an area code for a country in the Caribbean, like Jamaica, so you would not be subject to international call fees.

Joni wrote:

... only to repeatedly call your number throughout the day.

While that would probably be annoying, "annoyed" is not the same as "scammed".

Joni wrote:

This is part of a widespread one-ring scam.

Do enlighten us with your evidence (URLs to authoritative and respectable websites, such as government sites and major news sites) of that claim.  (A look at the site you quoted from indicates that it is neither authoritative nor respectable.)

I suggest that a more likely scenario is that your number was dialed by an automatic dialer and when the call started to ring it detected there was no available operator to transfer the call to when answered, so it simply dropped the call.