Unsolicited calls offering 40% off, backed up by texts from O2. Is this a scam?

[EW12]

I have been subjected to numerous calls all allegedly from O2 offering 40% off and all backed up by the security text system from O2. Is this a scam?

[MI5 · Accepted solution]

@EW12 

It's a well known scam.
Forward the scam number to 7726 - It's free.
Other ways to report here including Action Fraud website
https://www.o2.co.uk/help/safety-and-security/phishing-and-smishing-advice
How to block a number:
https://www.samsung.com/us/support/answer/ANS00062352/
https://support.apple.com/en-us/HT201229 

If you think you’ve been the victim of fraud – whether it’s because you’ve given details to someone over the phone, or clicked on a link in a suspicious text or email there are things you can do:
Contact your bank if you think you may have given out financial information. They can help protect your account and stop transactions.
Change your account and online account passwords. Not just your O2 account. All of them.
Forward fraudulent texts to O2 for free on 7726.
Contact Action Fraud on 0300 123 2040.
Call your Virgin Media or O2 customer services number if you think somebody’s taken out a contract using your details.
Virgin Media customers can phone 150 from their landline or 0345 454 1111 from any other phone.
O2 customers can call 202 from their O2 phone or 0344 809 0202 from any other phone.

[jonsie]

Hopefully you haven't given them the code texted by O2 gaining access to your My O2

Best to check your account