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Using Local SIM Cards: how it works in Indonesia — first-hand

Short answer
You can safely swap or remove an Indonesian SIM card without losing your internet package, as the data is tied to the SIM number and validity period. However, the SIM will only function in devices with an IMEI registered with Indonesian authorities; using it in an unregistered phone will result in a 'No Service' status.

From real experience

A physical Indonesian SIM card (e.g., Telkomsel) can be removed and reinserted, or swapped with another SIM (e.g., a home country SIM) without voiding the active internet package.
The internet package is tied to the SIM number and its validity period, not its continuous presence in the phone. Potential minor issues on Android devices after swapping include needing to manually re-select the Indonesian SIM for mobile data or a phone reboot. Vendor warnings about internet packages disappearing are generally incorrect.
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An Indonesian SIM card is tied to the IMEI of the phone with which it was initially registered.
If you wish to use an activated Indonesian SIM card in a different phone, the IMEI of that second phone must also be registered with Indonesian authorities. Unregistered foreign phones may have their SIM service blocked after a certain period (e.g., 3 months). IMEI registration can be done at airports upon arrival or at official telecom stores.
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Local Indonesian SIM cards only work in devices with a registered IMEI.
Tourist IMEI registration is valid for 30 days. Swapping a working local SIM card into an unregistered phone will result in 'No Service'. On dual-SIM Android phones, inserting the SIM into the wrong slot can trigger an IMEI block if only one slot was registered at the office.
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Official taxi counters are available at Bali airport exit.
Apps like Grab and Gojek can be used for transport. A local SIM card (approx. 10 USD) simplifies app usage, though registration via email is possible. Avoid hotel transfer premium prices if possible.
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Related topics

• Mobile IMEI Registration 🛂 Extending Tourist Visas • Bali Beaches and Swimming Conditions • Online e-VOA Application 🚕 Transport and Logistics 🎟 Return Ticket Requirements

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