Quick answer: The most common Bali SIM card problems come from a locked phone, an incompatible eSIM, unclear registration, choosing an outdated package, or leaving the counter before testing the connection. Check these points before paying and test mobile data with Wi-Fi switched off.
Page purpose: This guide helps international visitors prevent practical SIM and eSIM problems before and after arriving in Bali. For the complete buying process, read our guide to buying a SIM card in Bali.
1. Not checking whether your phone is carrier-unlocked
A local SIM or eSIM will not work if the phone is locked to your home carrier. Check the device settings or ask your carrier before departure. Paying off a device does not always unlock it automatically.
2. Assuming every phone supports eSIM
eSIM support depends on the exact model, country of purchase and carrier restrictions. Two phones with similar names can have different capabilities. Check for an EID in the device information and confirm the exact model before ordering. See our eSIM compatibility checklist.
3. Choosing a package from an old screenshot
Data allowances, validity periods and prices can change. Use the current product page at the time of purchase instead of relying on an old blog image or social-media post. Compare the total data, validity and whether a local Indonesian number is included.
4. Confusing SIM registration with Customs IMEI registration
They are related but different processes. A tourist SIM must be registered using valid customer details. Indonesian Customs explains that foreign devices used with an Indonesian SIM for up to 90 days can be registered through a mobile operator; longer use can involve different requirements. Read our SIM registration and IMEI guide and check the current official rules if your stay is longer.
5. Buying without checking who will provide support
A low price is not useful if the seller cannot help when activation fails. Before paying, confirm the provider, package, validity, registration process, pickup point and support contact. Avoid claims that promise perfect coverage or maximum speed everywhere.
6. Choosing by price alone
The cheapest plan may not match your itinerary. Consider coverage in the areas you will visit, trip length, expected video use, hotspot needs and whether each traveler needs a separate number. Our Telkomsel and XL comparison explains the trade-offs without claiming that one network is best everywhere.
7. Entering incorrect registration details
Use the customer and travel documents requested by the authorized seller. A typo in a passport number, name or arrival detail can delay activation. Ask how documents are handled and do not send identity documents to an unverified contact.
8. Leaving before testing the connection
After activation, switch off Wi-Fi and confirm that a webpage loads over mobile data. Also check the network indicator, messaging apps and hotspot function if you plan to tether. Fixing an APN or device setting is easier while support is still available.
9. Expecting the same signal and speed everywhere
Actual performance depends on location, terrain, buildings, congestion, device bands and network availability. A connection that works well near the airport may behave differently in a villa, on a beach or in a mountain area. Download essential maps and booking details for offline use.
10. Waiting until an urgent moment to solve a problem
Save the seller’s support contact, order details and package name. If several people are travelling together, activate and test each device separately. Do not assume one successful activation proves that every phone is compatible.
Pre-purchase checklist
- Phone is unlocked.
- Exact device model supports the chosen SIM or eSIM.
- Data allowance and validity fit the trip.
- Seller explains registration and required documents.
- Pickup point and operating hours are confirmed.
- Support contact is saved.
If your Bali SIM is not working
- Turn Wi-Fi off and restart the phone.
- Confirm that the correct SIM is selected for mobile data and roaming settings match the provider’s instructions.
- Check the APN and package status.
- Move outside or test in another location.
- Contact the seller or operator with the order details—never post identity documents publicly.
Travellers who want airport collection can review the pickup process after landing. To compare plans currently offered by Sim Card Airport Bali, use the current SIM and eSIM product page.
