A lot of people look for a tracker "without a SIM" to avoid a monthly fee, or one that keeps working where there's no signal. Both are possible - but only with the right kind of tracker. Here's how the underlying tech works, how the main types compare, and where Nelos fits.
A location tracker does two separate things.
Fixing its position. This is the GPS receiver inside the device listening for satellite signals and working out its own coordinates. It needs no SIM, no carrier, no internet, and costs nothing. Every tracker with GPS does this even with no SIM installed and no cell service around.
Sending that position out. This is the part that needs a transport for the coordinates to leave the device and reach your phone. It's what varies by type of tracker, and it decides whether the tracker works without cell service and whether there's a subscription.
In other words, "no SIM" doesn't mean "the location reaches you by magic". It means the device uses a different transport instead of the mobile network. The guide does GPS work without cell service covers the fixing-a-position half of this in more depth, for a phone rather than a dedicated tracker.
Tags such as AirTag have no GPS of their own. Nearby phones that take part in the maker's network - Apple's Find My, for AirTag - detect the tag over Bluetooth and report their own location. In a city, with phones everywhere, this works remarkably well and costs nothing per month. At an empty campsite there is usually no one around to detect it, and you can't ask the tag for an update. See AirTag vs GPS tracker.
The tracker reports its GPS position over LoRa - a long-range, low-power radio - to a compatible radio you carry, paired to your phone. With Nelos, your phone actively asks the tracker for its position, every few minutes or whenever you tap Refresh, and much more often in Find Mode. No SIM, no subscription, and no cell service needed anywhere. Range is much further than Bluetooth but depends on terrain, and you need to carry the radio. How LoRa GPS tracking works explains the details.
The classic GPS tracker: a SIM and a mobile modem upload the position to the maker's servers. Excellent coverage wherever there is signal, usually with a monthly plan. Without coverage, it keeps the position and waits.
The device reports its location over a satellite network. It works almost anywhere with a clear view of the sky, including places with no cellular infrastructure, and some devices can also send an SOS. In exchange, this kind almost always comes with a subscription, and the device is more expensive.
| Bluetooth tag (e.g. AirTag) | LoRa tracker + Nelos | Cellular tracker | Satellite tracker | |
|---|---|---|---|---|
| SIM card | No | No | Yes | No |
| Own GPS | No | Yes | Yes | Yes |
| Works without cell service | Only if passing devices can get online | Yes, within radio range | No | Yes |
| Internet needed to view | Yes | No | Yes | Usually |
| Ask for a fresh position | No | Yes | Often | Depends on device and plan |
| Recurring fee | No | No | Usually | Usually |
| Reach | Where participating phones pass | Your radio range, extendable with repeaters | Anywhere with coverage | Almost anywhere under open sky |
Many trackers that need no SIM still need the internet somewhere: a Bluetooth tag's location travels through other people's phones and the maker's servers, and you need a connection to see it. A LoRa tracker used with Nelos is different. The position goes from the tracker straight to the radio you carry, and the app shows it on a map you downloaded before the trip. Nothing in that chain needs the internet, which is what makes it useful in forests, mountains and rural areas.
Trackers that use the mobile network almost always need a plan, because every location report uses the carrier's data. Satellite trackers sit in the same place: no SIM, but usually a satellite service plan. Devices that use Bluetooth or LoRa have no recurring fee for the link, because they don't go through a carrier. The trade-off is the up-front device cost and a limit on range.
With Nelos specifically: the radio link has no fee, the app is free to start (including one tracker per team), and Nelos Pro - which adds unlimited trackers and longer history - is an optional one-time purchase, not a subscription.
Finding things you misplace around the house or city: a Bluetooth tag is enough and the cheapest.
Keeping track of a dog, a child or gear around you, out of coverage: a LoRa tracker makes sense, because it doesn't depend on cell service and you can ask it for a fresh position. See tracking a dog without cell service and GPS trackers for kids without cell service.
Tracking an asset that moves anywhere without you: a cellular tracker (with a subscription) or satellite is the practical choice, because you need the location to reach you from anywhere.
A remote expedition where you may need rescue: a satellite messenger or personal locator beacon, whatever else you carry.
A compatible GPS tracker running MeshCore firmware reports its location over radio, and the people in your team running Nelos see it on the shared offline map. No SIM, no account. On top of automatic updates, you can Refresh on demand, switch on Find Mode when something goes missing, set Safe Zones that alert you when a tracker leaves an area, and pause updates to save battery. The trackers section of the devices page lists compatible models, including the SenseCAP T1000-E, and LoRa Tracker vs Handheld Radio helps you choose who carries what. The Nelos tracking overview puts it all together.
One note: a tracker tells you roughly where a device is, not whether the person or thing is okay. For young children, it's a coordination tool, not a reason to relax supervision.
Yes. The GPS receiver needs no SIM to work out its position. What needs a SIM is sending that position over the mobile network. Trackers that use Bluetooth, LoRa radio or satellite instead have no SIM at all.
They can always fix their position, but only some can report it without cell service. A cellular tracker waits until it finds signal. A LoRa tracker used with Nelos reports over radio to your own device, and a satellite tracker reports via satellite.
Yes. Trackers that don't use a mobile or satellite network - Bluetooth tags and LoRa trackers - have no recurring fee for the link. With Nelos, the radio link has no fee, the app is free to start, and Nelos Pro is an optional one-time purchase.
Not with a LoRa tracker and Nelos: the location travels by radio to the device you carry, and the app works offline. You only need internet beforehand to download offline maps. Cellular trackers and Bluetooth tags such as AirTag need the internet to show their location.
Nelos requests GPS positions from compatible LoRa trackers over your own radio network, with Find Mode and Safe Zones. Compatible hardware required.
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