Received unsolicited txt and have been billed for it

[Kvn1]

How can I stop unsolicited premium txt to my phone? I have received 3 txt in last 3 weeks costing me £4.50 

[jonsie]

Some help here

Guide: Have you fallen for or been conned into a premium rate scam? What to do next 

Phishing, Smishing & Scams. Latest info & advice. 

[Bambino]

@Kvn1 Forward fraudulent texts to O2 for free on 7726.

You can block any number that call or texts you, or any number you think may be suspicious.

How to block a number:

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

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