Private Texting on Android: What SMS Cannot Do

Updated August 2026 · rewritten because the previous title called Signal an SMS app, which its own listing contradicts · every figure re-read on 8 August 2026.

This page is about private texting on Android, and the honest starting point is that the two goals pull apart: the app that carries your SMS is not the app that keeps a conversation private. Four apps compared on what each one actually sends, what its data safety section declares, and what it costs.

Internet only, no SMS

4.5 stars from 2,899,032 reviews · 100,000,000+ installs · free to install · in-app purchases $1.99 per item · no ads · by Signal Foundation · listing updated 5 August 2026 · Google Play listing · checked 8 August 2026

Signal is the app to use when a conversation genuinely needs to stay between two people, and it is also the app this page used to describe wrongly.

Read this first. Signal does not send SMS. Its own Play description says the app uses your phone's data connection so you can avoid SMS and MMS fees (Google Play, read 8 August 2026). Both people need Signal installed. This page previously carried a title calling it an SMS app, which was wrong, and the correction is the reason for this update.

• Good: End to end encryption covers messages, calls and attachments by default, with no setting to find first.
• Good: Its Play data safety section declares no data shared with third parties, which is the claim this page can actually stand on.
• Good: Run by a nonprofit rather than an advertiser, in its own words on the listing: “As a 501c3 nonprofit we are supported by your donations, not by advertisers or investors.”
• Con: The same data safety section also says the app may collect some data types, so "collects almost nothing" overstates what the store actually declares.
• Con: The listing carries in-app purchases at $1.99 per item, so unqualified "free" is not quite right either.
• Con: The network effect is the real cost: it only helps for the contacts you can persuade to install it.

4.5★2,899,032 reviews on Google PlayGet it on Google Play →

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SMS, MMS and RCS

4.2 stars from 44,760,037 reviews · 10,000,000,000+ installs · free to install · no in-app purchases · no ads · by Google LLC · listing updated 7 August 2026 · Google Play listing · checked 8 August 2026

Google Messages is the default on most Android phones and the app that carries your actual SMS traffic, including every verification code you receive.

Read this first. The fact this page owed you: Google Messages is the only one of the four here whose Play data safety section says the app may share data types with third parties. Signal, WhatsApp and Session all declare no data shared, and Session declares no data collected at all (checked 8 August 2026). It also carries an Independent security review badge that none of the others have, so this is a trade rather than a verdict.

• Good: No ads and no in-app purchases at all, the only app on this page that manages both.
• Good: RCS chats between Google Messages users are end to end encrypted, in Google’s own words on the listing: “your personal chats are protected with end-to-end encryption between Google Messages users”.
• Good: It is already installed, so it costs nobody a conversation about switching apps.
• Con: That encryption is scoped: between Google Messages users. A message to someone on a different app can fall back to plain SMS, which is not encrypted at all.
• Con: Data safety declares possible sharing with third parties, unique among the four here.
• Con: RCS availability depends on your carrier and region, which the listing states outright.

4.2★44,760,037 reviews on Google PlayGet it on Google Play →

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Internet only, no SMS

4.6 stars from 240,683,528 reviews · 10,000,000,000+ installs · free to install · in-app purchases $0.40 to $199.99 per item · no ads · by WhatsApp LLC · listing updated 5 August 2026 · Google Play listing · checked 8 August 2026

WhatsApp is the pragmatic answer when nobody will install anything new, and its encryption is genuinely on by default.

• Good: 240,683,528 reviews on a 10,000,000,000+ install band, so the contacts problem that limits Signal barely exists here.
• Good: Its Play data safety section declares no data shared with third parties, the same declaration Signal makes.
• Good: End to end encryption applies to messages and calls without configuration.
• Con: It belongs to Meta, and its own listing opens by saying so.
• Con: This page used to claim WhatsApp collects more metadata than Signal. The store cannot support that: their data safety labels are identical, so the claim needs a source outside the store or it should not be made.
• Con: In-app purchases run to $199.99 per item, which is worth knowing on a page about free apps.

4.6★240,683,528 reviews on Google PlayGet it on Google Play →

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Internet only, no SMS

4.7 stars from 32,239 reviews · 5,000,000+ installs · free to install · in-app purchases $4.49 to $29.99 per item · no ads · by Session Foundation · listing updated 9 July 2026 · Google Play listing · checked 8 August 2026

Session is the one to look at if handing over a phone number is itself the thing you want to avoid.

• Good: The strongest data safety declaration on this page: no data collected and no data shared with third parties.
• Good: It needs no phone number, in its own words: “No phone number or email required to create your Account ID”.
• Good: A 4.7 rating, the highest here.
• Con: A 5,000,000+ install band against 10,000,000,000+ for WhatsApp and Google Messages, so almost nobody you know is on it.
• Con: The listing carries in-app purchases from $4.49 to $29.99, despite the description calling the app free to use.
• Con: No phone number means no way for contacts to find you automatically; you exchange account IDs by hand.

4.7★32,239 reviews on Google PlayGet it on Google Play →

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Three different things get called "texting" on an Android phone, and they have nothing in common technically.

• SMS travels on the mobile network itself, needs no data connection, and has no encryption whatsoever. Your operator can read it. This is what carries verification codes.
• RCS is the modern replacement, running over data. In Google Messages it is end to end encrypted between Google Messages users, in Google’s own wording, and it falls back to plain SMS when the other side is not on it.
• Encrypted messengers such as Signal, WhatsApp and Session do not touch SMS at all. They send over the internet and encrypt end to end by default, but both sides need the same app.

That is the whole reason this page exists in its current form: the search that brings people here is about SMS, and the answer is that the private option is not an SMS app.

A setup that holds up, in the order that matters.

• Leave Google Messages as the default SMS app, since codes and delivery notices have to land somewhere.
• Install Signal and move the conversations you actually care about into it. Its data safety section declares no data shared with third parties.
• Turn on a screen lock and hide message previews on the lock screen. Encryption protects a message in transit, not from someone holding your unlocked phone.
• If handing over a phone number is the concern, look at Session instead, which needs neither a number nor an email.

What not to bother with: an app that promises to make SMS private. The format has no encryption, so the promise cannot be kept by anything running on your phone.

Signal’s permission requests map to features you can point at. Contacts lets it show which of your existing contacts are reachable, and declining it leaves Signal working, just with a list of numbers rather than names. Microphone and camera are for voice notes, calls and photos. Notifications are what make it usable at all.

What the store actually says, read on 8 August 2026: Signal declares no data shared with third parties, and also that the app may collect some data types, which is why this page no longer claims it collects almost nothing. That earlier wording went further than Signal’s own declaration.

One wording correction while we are here. An earlier version of this page said you could decline permissions and still send text messages. On a page titled as an SMS guide that reads as carrier SMS, which Signal cannot send. It means Signal messages.

The limits worth knowing before you commit.

• Signal: both sides need it, so it is only as useful as the contacts you can move. It also carries a $1.99 in-app purchase, so it is free to install rather than free of everything.
• Google Messages: the only one of the four declaring it may share data with third parties, and its encryption stops at the boundary of its own user base.
• WhatsApp: owned by Meta, with in-app purchases up to $199.99. Its store data safety labels match Signal’s exactly, which is why any claim that one collects more metadata than the other needs a source this page does not have.
• Session: the best declaration and the smallest audience, at 5,000,000+ installs against ten billion.

Checked 8 August 2026: this page was retitled and rebuilt. It previously ran under the headline "Signal: The Free Private SMS App We Trust on Android", while Signal’s own Play description says the app uses your data connection so you can avoid SMS and MMS fees. The page’s own FAQ already contradicted its headline in one undated line; that fact now sits in the body with its source. Google Messages is now disclosed as the only one of the four declaring it may share data with third parties. The claim that WhatsApp collects more metadata than Signal was removed: their Play data safety labels are identical, so the store cannot support it. Signal’s in-app purchase of $1.99 is stated rather than left out of an unqualified "free". Session, which declares no data collected at all, now carries figures and a store link instead of one passing clause. The two comparison images are gone: one marked Google Messages with a cross on end to end encryption, which Google’s own listing contradicts, the other claimed RCS is encrypted by default when Google scopes that to conversations between Google Messages users, and the third column of the grid named no product at all. A real table replaces them.