A friend of mine received two calls a few minutes apart yesterday morning around 4:30am and the area codes were 473 and 268.
She called me a couple of hours later and asked if I could tell where they originated from. Easy to do, just Google the phone number in this format: xxx-xxx-xxxx.
473 was from Grenada and 268 was from Antigua. I always check at least 5 sites to get a good handle on what I'm researching.
The sites I looked at had many people reporting those and a few other area codes as one or two ring callers. When people called them back, they have reported a multitude of scams. You just won't know which scam it is unless you call them back.
By no means is this list complete, but a few other international area codes that are reported to be associated with a high amount of various phone scams originate from:
876 (Jamaica)
809 (the Dominican Republic)
375 (Belarus)
371 (Latvia)
284 (the British Virgin Islands)
If a call is important, the caller will leave a message or let it ring longer, don't ya think?