Many smart phones come with plans that allow you to easily use your phone internationally. Check with your carrier. Otherwise, you might need to get a SIM card.
If you can't use your phone internationally, you can still use your cell phone in Bali if it’s a GSM (Global Systems for Mobiles) phone. Telkomsel (Indonesia) is the most popular phone network and uses 2 GSM bands, 1 UMTS band, and 2 LTE bands. You will need to replace your phone’s SIM card with a Telkomsel SIM card, and if the phone is locked it will need to be unlocked. Most stores that sell cell phones can do this. You can buy talk time and internet data in various denominations that are called in and credited to your account. After you return home, you can put the original SIM card back into your phone.
An alternative is to buy a phone locally. The cheapest phones cost around $27. Domestic call rates are around $0.02/minute; calls to the U.S. run around $0.07/minute.
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