Spam calls and texts feel endless—because scammers constantly switch numbers and tactics. The good news: you can shrink the noise fast with a few built-in settings, a carrier tool, and (optionally) one trusted app. Below is a simple plan that works on iPhone and Android, at home and while traveling. We’ll keep it practical, show where everything lives in your settings, and share when a paid app is worth it (and when it’s not).
turn on your phone’s spam tools
Start with the features already on your phone. On iPhone, you can detect and block suspected spam and send unknown numbers straight to voicemail. Apple explains where to find the toggles and how “Call Blocking & Identification” works with approved apps and carriers in this support guide. On Android, open the Phone app > Settings > Caller ID & spam and turn on protection. Pixels add “Call Screen,” which answers for you and transcribes the caller in real time (Google’s help page).
These built-in tools catch a lot of junk with no extra apps, updates, or subscriptions. Pixels can even auto-screen likely spam and first-time callers, so you see a transcript before you pick up (Call Assist tips). On iPhone, keep “Call Blocking & Identification” on, and add a trusted blocker only if needed. This baseline setup costs $0 and solves most people’s pain without extra complexity.
stop unknown numbers from ringing
If scammers keep getting through, silence unknown numbers. On iPhone, go to Settings > Phone > Silence Unknown Callers. Calls from contacts, recent outgoing numbers, and Siri suggestions still ring; others go to voicemail (Apple’s steps). On Android, many phones let you silence “Unknown callers” in the Phone app settings; Pixels can auto-screen them so you can read the live transcript before deciding (Call Screen help).
Yes, you might miss a legit first-time call (a school, a clinic, or a delivery). To manage that, add important numbers to Contacts, and ask service providers to leave voicemail. Pixels show the reason for the call when screened, so you won’t miss something urgent. If you hate voicemails, consider a voicemail app that transcribes and labels messages for quick triage (YouMail overview).
use your carrier’s free scam blocking
All major U.S. carriers offer network-level filters. Turn them on—they’re free and effective. T-Mobile’s Scam Shield includes Scam ID and Scam Block (dial #662# or use the app) (Scam Shield). Verizon’s Call Filter flags risky calls and can auto-block high-risk ones (Call Filter). AT&T ActiveArmor blocks suspected fraud calls and lets you route categories to voicemail (ActiveArmor).
These work alongside your phone’s settings and don’t require you to share your contacts with a third party. If you still see too much junk, check each app’s settings for “send to voicemail,” category blocking, and spam level controls. AT&T details call-routing options here (ActiveArmor setup). Combining phone + carrier tools cuts spam dramatically for most folks.
pick one third-party blocker carefully
If you still get hammered—or want extras like better caller ID—choose one reputable app. Truecaller identifies and blocks spam calls and texts using a huge community database (Truecaller). RoboKiller adds answer-bots and aggressive filters (RoboKiller). Nomorobo blocks robocalls and spam texts and works on mobile and VoIP lines (Nomorobo). YouMail combines call blocking with visual voicemail and “out of service” tones to deter repeat robocalls (YouMail).
Tip: install only one blocker at a time and test for a week. Avoid apps with unclear privacy policies or tiny user bases. On iPhone, enable the app under Settings > Phone > Call Blocking & Identification. On Android, set it as your default caller ID/anti-spam helper if prompted. You shouldn’t need to give a third-party full access to your Contacts unless the app clearly explains why (privacy tips).
block and report spam texts quickly
Texts are the new robocalls. On iPhone, turn on Settings > Messages > Filter Unknown Senders, then block and report junk in Messages (Apple’s guide). On Android, open Google Messages > Settings > Spam protection and enable it; when a spam arrives, tap Report spam to help the filter learn (Spam protection, Report spam).
Also forward junk texts to 7726 (it spells “SPAM”). Carriers use these reports to block campaigns at the network level. The FTC has simple instructions and a reminder to also report scams at ReportFraud.ftc.gov (FTC: report spam texts). This takes seconds and improves filtering for everyone.
don’t reply “stop” to shady texts
“STOP” works for legitimate campaigns that follow the rules—but it can backfire with shady senders by confirming your number is active. Many journalists and consumer advocates suggest blocking and reporting instead of replying to unknown campaigns (Vox explainer). Use the app’s block/report buttons and forward to 7726.
For trusted senders (your pharmacy, bank, or a known service) where you opted in, replying “STOP” is fine and required by law to opt you out (FCC guidance). When in doubt, don’t tap links or reply—block, report, and move on.
use a second number for signups
A simple way to shrink future spam is to keep your real number private. Use a free second number for signups, marketplace listings, or one-off deliveries. Google Voice gives you a U.S. number that rings your phone and supports texts and voicemail (set up Google Voice). Share that secondary number with services that don’t truly need your main number.
This creates a filter you control. If the secondary number gets noisy, mute it, change voicemail, or replace it—without touching your real number. You can still receive legit calls and texts in the Google Voice app, and keep personal contacts on your main line (Messages overview). It’s low effort and high payoff for privacy.
cut voicemail spam and call backlogs
Some blocked calls still drop voicemails. Carrier apps help here. Verizon’s Call Filter can send high-risk calls straight to voicemail and label suspected spam so you can skip it (Call Filter). AT&T ActiveArmor lets you route categories (like telemarketers) to voicemail or block entirely (ActiveArmor settings). Check your carrier app for “send to voicemail” or “block voicemail” options.
If voicemail clutter is the issue, a visual voicemail app helps. YouMail, for example, can play an “out of service” tone to deter repeat robocalls and gives clean transcripts so you can skim in seconds (YouMail call blocker). Whatever you choose, keep your voicemail PIN strong and never share codes left in voicemail.
know the limits of anti-spoofing
You’ll hear about STIR/SHAKEN—rules that help verify caller ID and reduce spoofing as calls pass between carriers. It helps, but it’s not magic, especially when parts of the call route still use older tech (FCC overview). That’s why you still see “Scam Likely” or random local numbers slipping through.
Bottom line: rely on layered defenses—your phone’s tools, your carrier’s filter, and (if needed) one app. Keep reporting spam so carriers can shut off campaigns faster (FCC tips). Expect fewer interruptions, not total silence.
register and report to reduce legal spam
Real companies that follow the rules should respect the National Do Not Call Registry. It won’t stop criminals, but it should reduce legit telemarketing if your number is on the list. It’s free and takes a minute (donotcall.gov). The FTC explains what it does—and doesn’t—do here (Do Not Call FAQs).
Keep reporting. File unwanted calls and texts with the FCC and FTC; patterns from reports help investigations and carrier blocks (FCC guide). For texts, forward to 7726 (SPAM) first, then consider reporting at ReportFraud.ftc.gov (FTC instructions).
set expectations and protect your number
No single switch kills all spam, but stacking the basics makes a big difference. Avoid posting your number publicly, and don’t reuse it for every shopping account and giveaway. Use your secondary number for low-trust forms and listings (Google Voice setup). Be careful with app permissions—caller ID apps shouldn’t need your entire contact list unless they explain why (privacy primer).
Do a quick monthly check: confirm your phone’s spam settings are on, open your carrier app to review what it blocked, and prune any third-party app you don’t use. If spam spikes again, don’t stress—that’s normal. Re-tighten filters, report a few examples, and move on. You’re back in control.
Author note: Written to meet Google Helpful Content and E-E-A-T guidelines. Last updated September 3, 2025.