Satellite phone

Some phones talk to space.

They send signals to tools in the sky. These tools are called satellites. Regular phones use towers on the ground. But these phones work where there are no towers.

You can use them on ships or planes. They help during big storms or earthquakes. Some new phones can even do this now.

They are very useful tools for people far away.

A satellite phone is a special kind of mobile phone.

Most phones connect to towers on the ground. But satellite phones talk to tools in space. These tools are called satellites. This helps people talk in places with no towers. You might use one on a ship or a plane. They are also great during big storms or earthquakes.

There are two main ways these phones work. Some satellites stay in a geostationary orbit. This means they stay in one spot in the sky. They can cover large areas of Earth. Other satellites use a low Earth orbit. These move fast around the planet. They orbit every 70 to 100 minutes. Because they move so fast, we need many of them. This is called a constellation.

Early satellite phones were very large. They needed long antennas to work. New models look like the smartphones we use today.

Some new phones can even send texts to space. This helps people stay safe in emergencies.

A satellite phone is a special mobile phone. It connects to the phone network using orbiting satellites. Most phones use towers on the ground to work. These ground towers are called terrestrial cell sites. Satellite phones work when those towers are not available. They can help in remote places or after disasters. You might use one on a ship or a plane.

How these phones work depends on the satellite's path. Some use geostationary orbit, or GEO. These satellites stay in a fixed spot in the sky. They can cover huge areas of the Earth. However, the signal travels a long way. This can cause a tiny delay called latency. Other systems use low Earth orbit, or LEO. These satellites move very fast around the planet. They orbit Earth every 70 to 100 minutes.

Because LEO satellites move so fast, we need many of them. This group of satellites is called a constellation. A satellite might only be visible for a few minutes. Iridium uses 66 satellites near the poles to provide coverage. Globalstar uses 48 active satellites for most land areas. Both of these systems started in the late 1990s. They both faced bankruptcy before being restructured later.

People have used satellites for talking for a long time. The first voice signals went through a satellite in 1958. This was the experimental SCORE satellite. In 1976, a system called MARISAT became the first dedicated mobile satellite. Later, the Inmarsat organization was founded in 1979. In 1963, Prime Minister Abubakar Tafawa Balewa used a SYNCOM satellite. He spoke with President John F. Kennedy using that tool.

Today, satellite technology is part of our everyday lives. Some new smartphones can talk to satellites for emergencies. The iPhone 14 added emergency messaging in 2022. The iPhone 15 added roadside assistance in 2023. Other phones like the Huawei Mate 50 also have this. Some phones even use a special antenna that pulls out. Using these services can be expensive for people. This is because launching and keeping satellites is a hard job.

A satellite phone, often called a satphone, is a mobile device that connects to the public switched telephone network. Instead of using terrestrial cell sites, which are ground-based towers, these phones communicate through orbiting satellites. This technology is vital because it provides connectivity in areas where traditional network coverage is unavailable or has been disrupted.

They are frequently used for maritime and aviation communication, remote expeditions, mining, and emergency response. Most of these devices support voice calls, text messages, and low-bandwidth data services.

The mechanism of a satellite phone depends on maintaining a line-of-sight to a satellite in space. When a user makes a call, the signal travels from the handset to a satellite orbiting the Earth. This satellite then relays the signal back to a ground station or network. Because the connection relies on space-based hardware, indoor reception is often limited. Users may need to use external antennas or repeaters to improve their signal.

While early handsets were large and required deployable antennas, modern models are much smaller. Some are now comparable in size to ordinary smartphones.

Satellite telephony systems generally operate using two distinct types of orbital paths. The first is geostationary orbit, known as GEO. These satellites orbit at a high altitude and appear to stay in a fixed spot in the sky. This allows a few satellites to provide near-global coverage. However, the long signal path introduces latency, which is a delay in communication. GEO service is reliable up to roughly 70 degrees latitude, but signal quality may drop near the poles.

The second type is low Earth orbit, or LEO. These satellites orbit much closer to Earth and move very quickly. They complete an entire orbit every 70 to 100 minutes. Because each satellite is only visible from a specific location for a few minutes, a large group is required. This group is called a constellation. For example, the Iridium network uses 66 active satellites near the poles to provide global coverage. The Globalstar network uses 48 active satellites to cover most land areas.

The history of this technology began shortly after the launch of Sputnik 1. In 1958, the experimental SCORE satellite transmitted the first voice signals via satellite. Later, in 1963, Prime Minister Abubakar Tafawa Balewa used a SYNCOM satellite to speak with President John F. Kennedy.

In 1976, MARISAT became the first dedicated mobile communications satellite. This was later integrated into Inmarsat, an organization founded in 1979. Many major LEO operators, including Iridium and Globalstar, launched in the late 1990s.

Using satellite phones can be significantly more expensive than using standard cellular service. This is due to the high costs of launching and maintaining satellites in space. Handsets typically cost a few hundred US dollars, while new broadband terminals can cost several thousand. Service fees often include a monthly base charge and per-minute rates that are higher than cellular equivalents. Furthermore, some governments, such as China, India, and Russia, place legal restrictions on these devices. They often cite concerns regarding national security or spectrum management.

In recent years, satellite technology has begun to merge with everyday consumer electronics. In 2022, Apple introduced emergency satellite messaging with the iPhone 14. The iPhone 15 expanded this in 2023 by adding roadside assistance. Other manufacturers have followed suit, such as Huawei with the Mate 50 series and Xiaomi with the 14 Pro Titanium Edition.

Some specialized devices, like the 2024 Thuraya Skyphone, even feature massive retractable antennas. These advancements allow standard smartphones to access life-saving communication in areas lacking terrestrial towers.