How can I distinguish a genuine O2 number

[OakleyOwl]

I have been called by 02046033582 and 02046033583 in conjunction with special offers from O2. Are these a genuine O2 numbers? The caller claims they are from O2 but when I asked them the name of O2 Chief Exec they did not know. So I ended the call.

How am I supposed to distinguish what are genuine O2 calls and what are scam?

[Bambino]

@OakleyOwl If it sounds too good to be true, it probably is a scam. If you're being offered a big discount it definitely is a scam. If they want you to change your password or send them a code, it's 110% a scam.
Block the number and report it free to 7726.
Don’t open any links or enter any information.
O2 advice here:

https://www.o2.co.uk/help/safety-and-security/phishing-and-smishing-advice
https://www.o2.co.uk/help/safety-and-security/unwanted-calls-and-messages
https://www.actionfraud.police.uk/

How to block a number:

https://www.samsung.com/us/support/answer/ANS00062352/

https://support.apple.com/en-us/HT201229

[gmarkj]

Put simply, if they call you don't trust anything @OakleyOwl 

Number spoofing is where a caller can pretend to be calling from any other number. Due to this, unless you make the call to a number you know/trust, do NOT give them any personal information or details.