Your phone may soon connect straight to a satellite. Here is how it works, what frequency and wavelength mean, and the simple maths behind signal delay and loss.
Satellite-to-phone works like a mobile tower in the sky. Two simple formulas explain most of it.
Phone coverage stops at the edge of the last mobile tower. Satellite companies want to remove that edge. This week's tech news covered SpaceX making an $8 billion move toward becoming a nationwide wireless carrier, and Starlink's plans for mobile service. The idea is simple: your normal phone connects to a satellite when there is no tower. Availability depends on your country and operator, and it is being rolled out region by region.
A phone talks to a tower using radio waves. A satellite works the same way, except the "tower" is flying overhead. The satellite receives your phone's signal, then passes it down to a ground station that connects to the internet. Services like Starlink use many small satellites in low Earth orbit so that one is almost always overhead.
Radio waves travel at the speed of light. The frequency (how many waves per second) and the wavelength (the length of one wave) are linked by one simple formula:
Higher frequency means shorter wavelength. Our Frequency/Wavelength calculator does this sum for you.
A 1.9 GHz mobile signal (1,900,000,000 Hz):
λ = 300,000,000 ÷ 1,900,000,000 ≈ 0.158 m (15.8 cm)
A 700 MHz signal:
λ = 300,000,000 ÷ 700,000,000 ≈ 0.429 m (42.9 cm)
A satellite is hundreds of kilometres away, and a signal gets weaker the farther it travels. Engineers calculate this with the free-space path loss formula, in decibels (dB). A bigger number means a weaker signal.
At 1,900 MHz, comparing a satellite 550 km away with a tower 5 km away:
Satellite: 20 log₁₀(550) + 20 log₁₀(1900) + 32.44 ≈ 153 dB
Tower: 20 log₁₀(5) + 20 log₁₀(1900) + 32.44 ≈ 112 dB
The satellite link is about 41 dB weaker, which is roughly 12,000 times less signal power.
A phone transmits at most about 0.2 W, so this is a big challenge. It is why satellites carry large antennas and why early services began with text messages before moving on to calls and data. See our power guide for how watts work.
Radio waves take time to travel, and distance is what decides how long. Older satellites sit in geostationary orbit, about 35,786 km up. Starlink-style satellites orbit at roughly 550 km.
Low orbit, 550 km: 550 ÷ 299,792 ≈ 1.8 ms one way
Geostationary, 35,786 km: 35,786 ÷ 299,792 ≈ 119 ms one way
Going up and back down is double: about 3.7 ms for low orbit and 239 ms for geostationary.
Real internet delay is higher, because of processing and extra links, but low orbit is far better for calls and video.
Try each one before you open the answer.
300,000,000 ÷ 900,000,000 ≈ 0.333 m (33.3 cm).
1,200 ÷ 299,792 ≈ 0.004 s, or about 4 ms.
300,000,000 ÷ 0.1 = 3,000,000,000 Hz, or 3 GHz.
Satellite-to-phone services use satellites that act like mobile towers in the sky. The satellite receives your phone's radio signal and passes it to a ground station connected to the internet.
Frequency is how many wave cycles pass each second, in hertz. Wavelength is the length of one wave. They are linked by wavelength = speed of light ÷ frequency.
It is much closer, so signals arrive in a few milliseconds instead of over 100 milliseconds, and the weaker distance loss helps small phone antennas.
It needs a clear view of the sky and usually does not work well indoors. Availability also depends on your country and operator.
News details are based on tech news roundups from early October 2026, including Tech Startups and TechRadar. Services, bands and availability change, so check your operator for current details. The calculations use example figures.
Turn any frequency into wavelength, or the reverse, in one tap.
Open the Frequency/Wavelength Calculator