Custom SIM card in Tesla Model 3 2024, Tesla Model Y 2025 and Cybertruck

a year ago

Tesla vehicles come with eSIM or built-in SIM cards for 4G/5G connectivity, but these only work in official markets.
In non-official regions, connectivity is absent, but installing a local SIM card can resolve this issue.
Newer Tesla models (Model 3 Highland, Model Y Juniper, Cybertruck) feature a separate Tesla Telematics Control Unit (TCU) for connectivity.
The TCU includes LTE/5G modem, WiFi, and Bluetooth, connected to the main computer via Ethernet.
TCUs vary by region (North America, Europe, Asia), with potential LTE band compatibility issues.
To install a local SIM, access the TCU under the headliner, following specific teardown instructions for each model.
Activating the external SIM requires Tesla Toolbox and Service+ mode, accessible via a paid subscription.
Switching to an external SIM involves using the Toolbox to toggle SIM settings in Service Plus mode.
After switching, the car's modem registers with the new operator, and connectivity status updates in the Infotainment menu.
Using an external SIM requires manually sending an SMS to wake the car for app connectivity, avoiding unnecessary power drain.

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