Satellite texting on phones: how it works, what you need

A few years ago, texting from a place with no mobile signal meant carrying a dedicated satellite phone or messenger. Now many ordinary smartphones can do it. The catch is that "satellite texting" means different things on different phones and networks, and it only works in certain countries. This guide explains how it works, what you need and how to get it ready before you head off-grid.

How a phone talks to a satellite

Satellites are hundreds or thousands of kilometres away and moving fast, while a phone has a tiny antenna and a small battery. That's why satellite links on phones are slow and carry mostly text. There are two main approaches.

1. Dedicated satellite spectrum (MSS). The phone's modem is built to talk to a satellite operator on its own frequencies. Apple's iPhone features use Globalstar's network, and Google's Pixel phones use Skylo. Because the phone needs specific hardware, only certain models support it. You usually have to step outside and, on iPhone, follow on-screen arrows to point the phone at a satellite.

2. Direct-to-cell using carrier spectrum. Here the satellites act like cell towers in space, broadcasting on a mobile carrier's normal frequencies. In the US, T-Mobile's T-Satellite works this way with SpaceX's Starlink. Many recent phones connect without special hardware, just a software update, and there's no need to point the phone: when there's no other network, it connects automatically. Europe's biggest carriers are now exploring a joint bid for satellite spectrum to offer something similar.

What you can actually do

Satellite links are narrow pipes, so expect text first:

• Emergency texting. Apple's Emergency SOS via satellite (iPhone 14 and later) and Google's Satellite SOS (Pixel 9 and later) let you text emergency services with your location when you have no signal. Google has just extended free Satellite SOS on the Pixel 9 by a year.
• Texting friends and family. Apple's Messages via satellite supports iMessage and SMS on iPhone 14 or later with iOS 18. T-Satellite handles texts on supported phones.
• Location sharing. iPhone can share your location through Find My via satellite; T-Satellite lets you send a location pin in a message.
• Some apps and data. T-Mobile says T-Satellite now supports picture and audio messages, satellite data and a list of optimised apps, such as WhatsApp, Google Maps and AllTrails, on select phones.

What you can't do: normal voice calls, video, browsing or streaming. On iPhone, Messages via satellite can't send photos, voice messages or group chats.

How fast is it?

Slow, and it depends on what's above you. Apple says that in ideal conditions, with a clear view of the sky and horizon, a message might take about 30 seconds to send, and over a minute under light or medium foliage. Under heavy tree cover, in canyons or indoors you may not connect at all. T-Mobile says much the same: messages may take longer, and coverage can be blocked by buildings, mountains, trees, planes and ships.

Which phones and countries are supported?

This is where most people get caught out. Support depends on four things: the phone model, where it was bought, the country you're in and sometimes your carrier.

• iPhone: Messages via satellite needs an iPhone 14 or later and works in the US, Canada, Mexico and Japan. Apple doesn't offer satellite features on iPhones bought in Armenia, Belarus, mainland China, Kazakhstan or Russia. Emergency SOS via satellite is available in more countries than Messages, so check Apple's list for yours.
• Pixel: Satellite SOS arrived with the Pixel 9 series and works only in the countries Google lists on its support page.
• T-Satellite: covers the continental US, Puerto Rico, Hawaii and parts of southern Alaska, with partner coverage via Rogers (Canada), Telstra (Australia), One NZ (New Zealand) and KDDI (Japan). Use T-Mobile's IMEI checker to confirm your phone.

For readers in Ukraine and most of Europe, phone-to-satellite texting is still limited. Starlink is widely used in Ukraine, but through dishes and terminals, not phones; see our report on Starlink and Starshield speeds in Ukraine. If you need guaranteed off-grid messaging today, a dedicated satellite messenger or satellite phone is still the dependable choice.

What does it cost?

Emergency features are mostly free for now. Apple's Messages via satellite is free for two years after activating an iPhone 14 or later, and Apple has repeatedly extended its free emergency features. Google's Satellite SOS on the Pixel 9 is now free for three years. T-Satellite is included with T-Mobile's top plans; T-Mobile also offers it to customers of other carriers for $10 a month, which needs an unlocked phone with eSIM. Our eSIM explainer covers how that works. Prices and promotions change, so check before you travel.

How to get ready before a trip

1. Check support for your exact model and country on Apple's, Google's or your carrier's site.
2. Update your phone and the apps you plan to use while you still have Wi‑Fi.
3. Try the demo. On iPhone, go to Settings > Apps > Messages > Satellite Connection Demo.
4. Turn on iMessage and set emergency contacts in advance; on iPhone, emergency contacts and Family Sharing members can text you first via SMS.
5. Download offline maps and sign in to any satellite-ready apps before you lose signal.
6. Bring power. Searching for a signal drains the battery fast; a power bank is cheap insurance, and it helps to know your battery health.

What's next

Satellite links on phones are improving quickly. SpaceX wants to turn Starlink Mobile into a full carrier, and US carriers are pushing back at the FCC, while European operators are preparing their own bid. Expect faster speeds and more apps over the next few years, along with paid plans once the free emergency periods end.