How-to guides
Short, factual answers to the questions behind most number lookups: where a number is from, whether a call can be trusted, and what actually reduces robocall volume.
| Guide | In one line |
|---|---|
| How to find out where a phone number is from | Use the area code and prefix to locate where a US number was issued — and understand why that is not always where the caller is. |
| How to report robocalls | Where to file robocall complaints so they actually feed enforcement: FTC, FCC, and your carrier. |
| How to check if a number is toll-free | Seven codes — 800, 833, 844, 855, 866, 877, 888 — are toll-free. Everything else is not, including lookalikes. |
| What is STIR/SHAKEN and does it stop spoofed calls? | The caller-ID authentication framework US carriers must run, what it can and cannot do. |
| How to block unwanted calls | Carrier tools, phone settings and call-blocking apps — layered defense against robocalls. |
| How to register on the Do Not Call list | Free, permanent, takes two minutes — and what it realistically changes. |
| How to tell if a call is spoofed | Signals that the number on your screen is not the real origin — and how to verify a caller properly. |
| How to report an IRS impersonation call | The exact channels for tax-scam calls: TIGTA, the FTC, and [email protected]. |
| How to verify a caller claiming to be your bank | One rule covers it: hang up and call the number on your card. Everything else is detail. |
| What is an overlay area code? | Why one place has several area codes, and what an overlay changes for dialing. |
| Why do local numbers keep calling me? | Neighbor spoofing explained with the numbering mechanics that make it possible. |
| How to read a US phone number (NPA-NXX-XXXX) | What each part of a ten-digit number encodes, and which digits are impossible. |
| How to look up which carrier holds a prefix | Using public NANPA assignment records to find the code holder for any NPA-NXX. |
| What happens when an area code runs out of numbers? | Exhaust forecasts, jeopardy status, and how relief overlays arrive. |
| How to stop spam texts | Report to 7726, block, and never tap links — the smishing playbook. |
| Is calling an 855 number free? | Yes — 855 is toll-free. What that means precisely, and the edge cases. |
| Can you get off robocall lists? | What actually reduces call volume — and the 'removal' offers that increase it. |