For  a cell phone, some already have call blocking, if not, there are free apps on the web that will work for some. You can google this. If you have a smart phone, there is a free app called call control. Iphones appear to have apps also. Another one is called Mr. Number.

Report your callers here, not just to the DNC alone:

https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2

For text messages: forwarding any text message spam you get to the short code  “7726,” which spells “spam” on most phones, to alert your network operator to the abuse. ATT won't accept 7726 But they will accept BLOCK and return a message that the web site is blocked. forward the texts to 7726 or BLOCK, depending on your phone carrier.

By State DNC lists:
http://800notes.com/res/DoNotCall.aspx

FCC Abandoned Calls Complaint form:
http://www.fcc.gov/cgb/consumerfacts/1088D-R.pdf
email:  fccinfo@fcc.gov

I received the following text from "Steve" at this number 4172000526

Sydney, heres the link to the biz opp I was talking about http://my1url.com/30/?f72a647f got ya in free so see what you think. call ya - Steve

I did not reply.

I just received the same text with the same link about a business opp from Steve. "Got ya in free so see what you think. call ya- steve"

Yeah, I just got the same text from "Steve".
Jim, heres the link to the biz opp I was talking about http://my1url.com/30/?30aba1dc got ya in free so see what you think. call ya - Steve
Didn't respond. I advise against it. Likely a phishing scam.