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Official Languages: Indonesian

English is commonly spoken in tourist areas such as Bali and parts of Jakarta, but it is less common in smaller towns and rural islands. Basic Indonesian phrases are useful for transport, markets, and local restaurants.

Mobile Network: Mobile service is generally good in major cities and popular tourist areas, with 4G widely available and 5G present in some urban zones. Coverage can weaken on remote islands, mountain areas, and at sea between islands.

Roaming/SIM/eSIM: Roaming is convenient for short stays but often costs more. A local SIM is usually the cheapest option for longer trips if your phone is unlocked, and it works well for domestic data needs. eSIM can be the simplest choice for many travelers because it can be installed before arrival, but availability and pricing vary by provider and device. For most visitors, eSIM is best for convenience, local SIM is best for value on longer stays, and roaming is best only for brief trips or backup service.

Cards are widely accepted in hotels, malls, supermarkets, and many restaurants in major tourist areas, but cash is still important for small shops, local eateries, markets, parking, and transport in many places. Contactless payment is growing but not universal.

Tipping is appreciated but not always mandatory. Many mid range and upscale restaurants add service, so check the bill first. If no service charge is included, rounding up or leaving about 5 to 10 percent is commonly appreciated for good service. Small tips are useful for drivers, hotel staff, guides, and porters, especially in tourist areas. For taxis and ride-hailing, rounding up is typical rather than giving a large tip.

Plug Type: Type C and Type F

Voltage: 230V, 50Hz

Adapter: Usually needed if your plugs are not Type C or Type F. Travelers from countries using 110V should also check device compatibility or bring a converter if the device is not dual voltage.