Spam calls from another operator?

[Dezb]

Anyone else received spam calls from another operator? Claiming to be associated with O2 and offering to reduce the bill. Cheeky sods.

I guess the main question to 02 is - how did they get my number and know that I'm on 02? (And no, I don't put my number on random internet sites)

[Cleoriff]

@Dezb 

You need to go into MyO2 http://www.o2.co.uk/myo2 and look for the MORE button. A drop down menu will show contact preferences. Check all are unticked.

[Bambino]

@Dezb O2 has what are laughingly called 'trusted partners'. If you want to opt out of receiving messages from them go to your MyO2 page and change your preferences: http://www.o2.co.uk/myo2

You can also block the number and report it free to 7726.
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

[MI5]

@Dezb 

Scammers can look up the number ranges to determine which network they originated from and then hope the number hasn't been ported out to a different network.

In short, they don't necessarily know which network you are on now, just what network the number was originally associated with.