How to Block Phone Numbers: A Step-by-Step Guide for Every Device
Unwanted calls and texts are frustrating at any age—and they're a real problem for seniors, who are disproportionately targeted by scams and robocalls. The good news: blocking numbers is straightforward on nearly every phone, and the process works the same way whether you're dealing with spam, harassment, or an unwanted contact. This guide walks you through your options.
What "Blocking" Actually Does
When you block a number, that caller cannot reach you through voice calls, text messages, or voicemails—depending on your phone type and what you block. A blocked caller typically sees the call go to voicemail or receives a message saying the call couldn't go through. They won't know they've been blocked, though they may suspect it after repeated attempts.
Blocking is not the same as reporting a number, though many phones let you do both at once. Reporting alerts your phone company or app provider to patterns of abuse; blocking is personal and affects only your phone.
Blocking on iPhone 📱
To block a number:
- Open the Phone, Messages, or FaceTime app
- Find the contact or number you want to block
- Tap the info icon (circle with "i") next to the contact
- Scroll down and select Block this Caller
- Confirm your choice
To see or unblock:
Go to Settings > Phone (or Messages) > Blocked Contacts. You can unblock any number from this list.
iPhone also has a Silence Unknown Callers feature (Settings > Phone > Silence Unknown Callers) that automatically sends calls from numbers not in your contacts to voicemail—useful if you want a gentler filter.
Blocking on Android 📱
Steps vary slightly by phone model, but the process is similar:
- Open the Phone app and find the contact or recent call
- Tap and hold the number
- Select Block or Block number
- Confirm
To manage blocked numbers:
Go to Phone > Settings > Blocked numbers (the exact path depends on your phone maker).
Some Android phones also offer Call Filter or similar apps that can automatically screen unknown numbers.
Blocking via Your Phone Service Provider
If unwanted calls are overwhelming, you can ask your phone company (Verizon, AT&T, T-Mobile, etc.) to block numbers directly. This stops calls before they reach your phone and can help with robocalls in particular.
Strengths:
- Works across all your devices on that service
- Carrier-level tools sometimes catch patterns you'd have to block manually
Limitations:
- Depends on your carrier's tools and plan
- May have limits on how many numbers you can block
- Doesn't always catch spoofed numbers (calls that fake a number to appear local)
Contact your carrier's customer service to ask what blocking options are available on your account.
Third-Party Blocking and Filtering Apps
Apps like TrueCaller, RoboKiller, Nomorobo, and others specialize in filtering calls before they reach you. They work by checking incoming numbers against known spam and scam databases.
How they differ from built-in blocking:
| Feature | Built-In Blocking | Third-Party Apps |
|---|---|---|
| Cost | Free | Often free; some paid upgrades |
| Setup | Immediate; one number at a time | Requires installation |
| Coverage | Numbers you choose | Automatic filtering based on databases |
| Spoofed numbers | Limited help | Better at detecting patterns |
| Privacy | Stays on your phone | Data policies vary by app |
Research any app's privacy policy before installing—some request access to your contacts or call history.
Key Variables That Affect Your Results
Type of unwanted call: Robocalls (automated) respond well to carrier or app-based filtering. Personal harassment is best handled with direct blocking.
Your phone model and age: Newer phones have more built-in filtering. If you have an older device, a third-party app may offer more protection.
Your carrier: Some carriers include spam-filtering tools in their standard service; others charge extra or offer limited options.
How many numbers: If it's one or two contacts, built-in blocking works fine. If you're getting dozens of spam calls daily, a filtering service may save time.
What Blocking Won't Do
- Stop spoofed calls: Scammers can fake the number that appears on your screen, so blocking won't help if the same scammer uses different fake numbers.
- Stop determined harassment: If someone is harassing you, blocking should be part of a larger response (contact police or your carrier's abuse team).
- Remove your number from call lists: Blocking stops future calls from that number—it doesn't prevent other numbers from reaching you.
When to Escalate Beyond Blocking
If you're receiving repeated unwanted calls despite blocking, or if the calls involve threats or harassment, contact:
- Your phone carrier's customer service or abuse team
- The Federal Trade Commission (FTC) if it's fraud or scams (reportfraud.ftc.gov)
- Local law enforcement if it's harassment or threats
Getting Started
The right approach depends on your situation. If a handful of specific numbers are bothering you, use your phone's built-in blocking—it takes seconds and requires no setup. If you're overwhelmed by spam, explore your carrier's options or a filtering app. Most people find that a combination (built-in blocking for known contacts + carrier or app filtering for unknowns) works best.
