I was setting up a new account for an old-school server and didn’t want to use my real number. Tried Google Voice, but couldn’t get access from my region. Ended up using
https://sms-verification-number.com/en/ - got a US number with T-Mobile compatibility. Code arrived in about 50 seconds. Since it’s a real SIM-based number, not VoIP, the activation went through first time. Used the same number later for a Discord setup - still active within the 20-minute window.