A text message does not use the internet. That one fact is why SMS still matters in 2026: it is the only messaging on your phone that works when mobile data is off, the Wi-Fi is gone and you have a single bar of signal. Nothing to install, nothing to configure, and it is already on your phone.
SMS is not an internet message. It travels on the control channel of the mobile network, the same low bandwidth signalling path your phone uses to tell the network it exists and to set up calls. That channel is available wherever you have any usable signal, independently of whether you have a data allowance, whether data is switched on, or whether you are in a Wi-Fi dead spot.
Practically: turn mobile data off entirely, disconnect from Wi-Fi, and a text will still send. A WhatsApp message in the same conditions will not.
This is what makes SMS the fallback worth knowing. It is the last thing to stop working, which is why banks send verification codes by it and why it survives in places where data does not.
Nothing needs installing. Google Messages is the default messaging app on Pixel, Samsung, Xiaomi and Motorola phones among others.
Modern messaging apps prefer RCS, the richer chat protocol that gives you typing indicators, read receipts and full quality images. RCS runs over the internet, so it stops working precisely when you need the fallback.
Most of the time the app handles this: when RCS cannot connect, it drops back to SMS on its own, sometimes after a delay while it tries. If you want to force it:
Worth knowing: turning RCS off also removes read receipts and end to end encryption between RCS users, and images will send as low resolution MMS. That is the trade.
The apps are free. The message may not be.
On a modern contract with unlimited texts, sending costs nothing regardless of volume. On a pay as you go plan or an older tariff, each message is charged, and the charge is per message rather than per conversation, which matters for the next section. Texting a number abroad is charged at an international rate on most plans, and receiving while roaming may also be chargeable.
Sending a photo turns the message into an MMS, which is charged differently again and is often expensive relative to its usefulness. If you have any data at all, send pictures another way.
A single SMS holds 160 characters of plain Latin text. Longer messages are split and reassembled by the receiving phone, so the recipient usually sees one message, but you may be billed for each part.
The trap is that one character can change the arithmetic. Using an emoji or certain accented characters switches the message to a different encoding, which drops the limit to 70 characters per part. A short message with one emoji can therefore cost more than a longer message without one. If you are paying per message, turn on the character counter in your messaging app settings and keep an eye on it.
Work through these in sequence rather than at random.
SMS has no end to end encryption. Messages pass through your carrier in a form the carrier can read, and they are retained according to its policies. Treat a text as roughly as private as a postcard.
This has a direct consequence worth acting on: SMS is a weak second factor for account security, because it is vulnerable to SIM swap attacks. Where an app offers an authenticator or a passkey instead of texted codes, take it.
When you do have data, an encrypted messenger is the better choice for anything sensitive. SMS earns its place as the thing that works when nothing else does, not as the thing you should use by default.
Yes. SMS travels on the mobile network signalling channel rather than the internet, so it needs only usable signal. Turn data off entirely, disconnect Wi-Fi, and a text will still send where an internet based messenger will not.
The one already installed. Google Messages is the default on most phones and needs no setup. A different app is worth it only if you want a specific interface or more control over scheduling and blocking.
The reliable way is to remove internet access: turn off mobile data and disconnect Wi-Fi, and the app falls back to SMS. To make it permanent, turn off RCS or chat features in your messaging app settings, accepting that you lose read receipts and full quality images.
One SMS holds 160 characters of plain text. Longer messages are split and reassembled by the recipient, but you may be billed per part. Adding an emoji or some accented characters changes the encoding and drops the limit to 70 characters per part.
No. There is no end to end encryption, and messages pass through your carrier in readable form. Use an encrypted messenger for anything sensitive, and prefer an authenticator app or passkey over texted codes for account security.
Signal, then aeroplane mode, then the number format including country code, then credit on pay as you go. If all of those are fine, confirm which messaging app is set as default in Android settings, since only the default can send.