In one sentence

Familiar from the first second

It is a texting app, and it is laid out like one, using the colours and controls iOS gives every app on the platform.

Green for what you send, grey for what arrives, one row per correspondent and a keyboard at the bottom. Nothing here needs a tutorial, because the whole point is that reading a text from a SIM 9,000 km away should feel exactly like reading a text from the phone in your hand.

What it does

Six things, done properly

It is a small app. Everything it has is here, and everything it does not have is on purpose.

One thread per sender

Incoming messages are split into conversations by who sent them, in the order you last heard from them.

Every SIM, kept apart

The same number writing to two of your SIMs is two conversations, not one, because a reply has to leave on the line it arrived on.

Send, not forward

You type in the app and the SMS leaves the handset at home from your real number. The recipient sees nothing unusual.

Push, not polling

A silent push wakes the app the moment something arrives, so a code reaches you while it is still valid.

Search that finds codes

Search runs over messages held on your own device, so looking for last month's reference number does not involve a server.

Tap to copy a code

The thing you came for is usually six digits in the middle of a sentence, so the app makes them straightforward to lift out.

How it is built

Small, quiet, native

The decisions behind the app matter more than its feature list, so here they are.

Face ID at the door

The app locks itself. Somebody holding your unlocked phone still does not get your bank codes.

Light and dark, properly

Every colour is a system colour, so the app follows the phone at sunset and respects the accessibility contrast settings.

iPhone and iPad

One build covers both, with a two-column layout on the larger screen instead of a stretched phone interface.

No accounts, ever

There is no directory of users, no username, no profile and no password to lose. Your identity is a key on your device.

Before you start

What it runs on, and where it is

Two honest tables rather than a download button that does not work yet.

Platform

iPhone and iPad, in one universal app.

At home

An Android phone holding the SIM, on mains power and on wifi. It needs to be the phone's default SMS app to do its job.

Connection

Any internet connection on your side. No roaming, no mobile signal and no SIM at all in the phone you carry.

Cost

Nothing. Outgoing messages are ordinary SMS sent by your own SIM, so your operator charges for them as it always has.

Accounts

None. Pairing is a QR code shown by the phone at home and scanned by yours.

Not on the App Store yet

The app is finished and in testing, and the relay behind it is live. It has not been released publicly yet, so there is nothing on this page to download. If you want to try it while it is in testing, say so and we will tell you when a build is available.

Ask for a test build

The full list

What you get, plainly

Twelve statements, each one either true today or not on this list.

Every SMS your SIM receives, on your phone

Replies sent from your real number

Several SIMs at once

Conversations grouped by sender

Instant push notifications

Notifications that carry no message text

Face ID lock on the app

Light and dark appearance

iPhone and iPad in one app

No account and no password

No adverts and no analytics

Free, with nothing to buy inside

SimTether has not been independently audited, and an SMS crosses the mobile network in the clear long before it reaches the phone at home. We protect everything after that point, and we say so plainly rather than calling it end-to-end encrypted.

Now read what it cannot protect

Your SIMs, on the phone you actually carry

Familiar from the first second

Six things, done properly

Small, quiet, native

What it runs on, and where it is

What you get, plainly

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Head office

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