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They'll buy tons of phone numbers from all over so they always have local numbers to call from. They just use VOIP software to route it to wherever the call center is located. As far as their provider is concerned, they're probably just a local business. Or, at most, a local number for a foreign company.

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Phone numbers can be spoofed, anyway. If you call back a robocall spam number, you'll reach a very confused human. And I've received a bunch of robocalls from my own number.

As I said in another comment, why allow international numbers to spoof national numbers?

In the parent's description, it's not spoofing at all. They've purchased real american (local) phone numbers, and are routing calls through them through other means (like internet...). There's no telephone network level trickery or spoofing going on.

Ah. Any idea why it wouldn’t be a problem (from what I’ve heard) in the UK then?

Not always. They will spoof legitimate numbers that they don't own. If you call them back you'll usually get some very confused person who just got a bunch of calls accusing them of making spam calls.

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