Can a website charge you through a test message?

I was on a web site on my phone and when I opened the site it a phone number on my iPhone popped up and I called it because i thought some one was calling me. Then I received a text password with a free trial that lasts 3 days then they will charge you 30$ I did not follow the link and deleted the message can they charge you. It also said you don't need a credit card. So am I screwed or what?

Yes they can and will.

They will claim that by calling the number they gave you, you have agreed to them charging you.

Contact your telephone service supplier IMMEDIATELY and explain.