GTC Airtime Buying Guide

Airtime is what makes your satellite device usable off-grid, for voice, SMS, tracking, and data. This guide explains how airtime works, how SIMs behave, and how to choose the right plan type.

The best satellite airtime plan depends less on the device itself, and more on how, where, and how often you plan to use it.

Some users only need a satellite phone switched on for emergency backup during occasional trips. Others rely on always-active tracking devices, offshore communications, or high-usage satellite internet systems operating every day in remote locations.

This guide breaks down the most common real-world use cases and explains which airtime solutions typically make the most sense for each scenario, from expeditions and overlanding to marine operations, lone worker safety, and remote internet deployments.

The 3 Questions That Usually Decide Your Airtime

1. How often will the device actually be used?

If the device is only switched on a few times per year, prepaid airtime is often the simplest route. For permanently deployed equipment or regular usage, monthly service plans usually make more financial sense.

2. Is this for emergency backup or daily operational use?

Emergency-only devices often prioritise low ongoing cost and long standby periods, while operational systems prioritise continuous service availability and predictable monthly access.

3. Are you using voice, tracking, or broadband data?

Voice calls and GPS tracking use relatively small amounts of airtime compared to satellite internet. Streaming, video calls, cloud syncing, and large uploads can dramatically increase data requirements.

Crossing the Atlantic?

For ocean rowing and offshore expeditions, continuous active service and truly global coverage are usually more important than minimising monthly costs. Iridium monthly airtime is often preferred because coverage extends across open ocean routes and polar regions.

Taking On Remote Desert Routes?

For overlanding, remote road trips, and off-grid vehicle travel, prepaid satellite airtime gives flexibility without committing to a long-term contract. It is commonly paired with handheld satellite phones, messengers, and emergency communication devices.

Running Remote Infrastructure?

Tracking systems, remote monitoring equipment, and permanently deployed assets are typically better suited to monthly airtime plans that maintain uninterrupted service and predictable reporting.

Using Starlink Offgrid?

Satellite internet consumes significantly more data than voice or tracking devices. Choosing the right Starlink or broadband service plan is critical if multiple users, streaming, or remote work are involved.

Satellite networks available

Globalstar airtime

Globalstar

Globalstar provides near global plans for their satellite phones and trackers, with Pre-Paid and Pay Monthly plans available. These include the Globalstar GSP-1700 satellite phones, Sat-Fi internet and SmartOne and SPOT Trackers.