Sky Mobile calls

"They claimed to be from a company - sky mobile , and offering free i phone 18 pro you just need to active code from sky app or from email account to receive free phone, all you pay for is postage £12 total for phone and receive next day promise, THIS IS A SCAM tel number comes up as +44 1942 950468 caller says they are in london and that it is a system generated number BUT its not a tel number he said. SCAM SCAM SCAM all DAY"