How to block spam texts on a Samsung phone
Picture a nightclub with two kinds of bouncer. The first has a clipboard of names and checks every face against it. The second reads what people are carrying. The first bouncer is fast, cheap, and completely beaten by anyone who shows up with a new name, which, in the text message business, costs less than lunch and takes about a minute. Every spam setting built into a Samsung phone is the first bouncer. That is not a complaint about Samsung. It is the reason the settings exist and the reason they are not enough.
First, which Messages app do you have?
Samsung phones sold in the United States since 2021 mostly ship with Google Messages as the texting app, with Samsung’s own Messages app still installed and available. Older phones and some carrier models run Samsung Messages. Open your texting app and look at the icon in the app switcher: a white speech bubble on blue is Samsung Messages, a blue bubble with a four-colour squiggle is Google Messages. The settings below cover both.
Samsung Messages
Open the app, tap the three dots at the top right, then Settings, then Block numbers and spam. Turn on Caller ID and spam protection. This checks the sender against a database of numbers that other people have reported, and texts from those numbers go to a Spam folder instead of the inbox. In the same screen, Block numbers lets you add a number by hand, and Blocked messages is where anything caught ends up. To block one sender from a conversation, open it, tap the three dots, and choose Block number.
Google Messages
Tap your profile picture at the top right, then Messages settings, then Spam protection, and turn on Enable spam protection. Google also matches senders against a list, with a little machine learning on top for the obvious patterns. In any conversation, the three-dot menu has Block and report spam, which blocks the number and sends the text to Google.
What both of them miss
Both settings are the clipboard bouncer. They are good at the lazy spammers: the ones who blast the same text from the same number to a hundred thousand phones and keep the number for a week. They are poor at everything that rotates numbers, which is now most of it. The toll scam that arrives from a different ten-digit number each time. The package-hold text from an email address. The campaign fundraiser sent one message at a time by a volunteer, on a number that is retired by Thursday. The “wrong number” hello that is the first move of a months-long con. None of those are on the clipboard yet, because the clipboard is built from reports, and reports come after the damage.
There is a second gap. Both apps still deliver the text to your inbox and notification shade before anyone decides anything. The spam folder catches what the list already knows. Everything else lands next to the message from your daughter.
The route that reads the message
On Android, only the default messaging app can decide what you see. A second app running alongside Samsung Messages cannot hide a text from it. So a real filter has to be the messaging app. That is what TextMeNot is: a complete texting app for Android that scores each new text from an unknown number on the phone against the patterns scammers, political senders, and bulk advertisers actually use, and files the matches under Screened with the reason shown. The toll lure, the deadline, the lookalike link, the home services pitch. It is the second bouncer. It does not care what name you came in under.
Texts from your contacts, conversations you have replied to, and one-time codes are never screened. Nothing you receive is sent anywhere, and there is no account. When you install it on a Samsung phone, Android asks once whether to make it the default messaging app; say yes, and your existing conversations appear in it. If you ever want Samsung Messages back, it is one setting under Apps, then Default apps, and nothing is lost.
The trade-off, stated plainly: Google does not let other apps use RCS chat, so while TextMeNot is your default you are on SMS and MMS, the way phones worked before the little blue bubbles. Here is the full explanation.
It is free for your first 20 screened texts and 20 screened calls, on Google Play, for Android 8 or newer in the United States. Keep the clipboard bouncer on too. Two doors are better than one, as long as one of them can read.