Yes. A SIM card is not needed for a prepared on-device AI task. OGAM (Off Grid AI Mobile) can run downloaded local models on a compatible phone using the phone’s own hardware. You still need a way to install the app and obtain the required model files, usually over Wi-Fi. After setup, local chat or dictation can work without mobile service or internet.
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Separate the SIM card from the model
A SIM or eSIM provides mobile-network service. A local AI model uses files stored on the phone and the phone’s processing hardware. These are different parts of the setup.
A phone without a SIM can therefore be useful as a local writing or dictation device if it supports the app and model. It does not need an active mobile-data plan for each local request.
This does not mean an unprepared phone can download an app or model while disconnected. Complete the installation and model setup first, and keep the material you want to use stored locally.
Check whether the phone is suitable
Start with the current mobile requirements. Check the operating system, available storage, and memory before choosing a model.
An older spare phone may be able to install the app but still struggle with a large model. Start with a small supported model and a short task you can verify. Do not assume that removing the SIM changes the device’s memory or processing limits.
Suppose you want a spare phone for dictating short workshop notes at a desk. That task needs a local speech model. It does not automatically need a large text model unless you also want AI replies or note organisation.
Complete setup over Wi-Fi
Connect the phone to a suitable Wi-Fi network and install OGAM from the appropriate store or supported release route. Store access and operating-system setup can have their own account requirements; that is separate from whether local inference needs mobile service.
Download only the models for the tasks you intend to use:
| Task | Required local component |
|---|---|
| Text chat | Text model |
| Speech-to-text | Transcription model |
| Organising dictated notes | Speech model plus text model |
| Image generation | Supported image-model package |
| Spoken replies | Supported voice-output resources |
Wait for the downloads and model loading to finish. A catalog entry or partial download is not a working offline model.
Start with a short local chat
Choose a downloaded on-device text model in the app. Open a new chat and ask a simple question whose answer you can check, or request a short draft from facts you provide.
For example:
Turn these three checked notes into a short checklist. Do not add tasks or dates that are not present.
Review the answer. This confirms that the selected model can perform your intended task on that phone. It does not establish that every model or feature will behave the same way.
Keep a local model selected. A remote-server selection requires a network route to the chosen host even if the phone has no SIM.
Set up dictation if that is the main use
Open Model Settings > Transcription (Speech to Text) > Transcription model. Under On-device models, download and select a suitable speech model.
For non-English speech, select a multilingual version and set the language under Chat Settings > SPEECH TO TEXT > Language. The mobile catalog’s multilingual Base download is approximately 142 MB. That is a file-size guide, not a total RAM requirement or accuracy guarantee.
In Chat mode, hold the microphone control inside OGAM, speak, and release it. The text appears in the composer for review. Use the app microphone rather than assuming the phone keyboard’s dictation control follows the same local path.
The v0.0.111 release source supports this on-device dictation route.
Run a real disconnected check
Once the setup works on Wi-Fi, turn Wi-Fi off. If the phone has no active SIM, it may already lack mobile data, but check the network state rather than assuming it.
Repeat the task:
- Load the selected local model.
- Open a fresh chat or start a short dictation.
- Produce a result from locally available input.
- Review names, dates, and important details.
- Save or copy the checked result where you intend to keep it.
If dictation produces text in an unsent message box, do not assume that is your permanent note store. Save the result through your normal workflow.
This is a readiness test for your phone, not a claimed device benchmark.
What still needs a connection?
Some actions remain online even when local inference does not:
| Action | Why a connection may be needed |
|---|---|
| Installing updates | New app files must be obtained |
| Downloading another model | The model is not yet stored locally |
| Opening a cloud-only file | The full source still needs downloading |
| Using a remote model | The phone must reach the model host |
| Sending email or sharing online | The destination service needs connectivity |
A phone without a SIM can use Wi-Fi for these actions when available. An internet-free task must avoid depending on them while disconnected.
Local network communication is another case: two devices may communicate over a suitable local network without mobile service, but that is not the same as having no network connection at all.
Keep the spare-phone workflow simple
If the phone is dedicated to one task, keep the relevant model and source material ready. Check storage before adding more downloads. Close unnecessary apps if memory becomes a problem.
Do not assume that a larger model is the next fix for every weak result. Check the input, language setting, recording clarity, and whether the selected model is appropriate.
A battery-powered phone also needs enough charge for the intended use. Test your own duration rather than relying on an unmeasured runtime estimate.
Make the device useful before adding complexity
A spare phone can be a practical local note or drafting device without a mobile plan. The useful boundary is clear: downloaded models and local inputs work on the device; services and files elsewhere need a connection.
Get OGAM and try one complete task over Wi-Fi first, then repeat it disconnected. If that works on your hardware, you have a useful offline AI setup without needing a SIM card.