Yes, you'll be able to use your mobile phone in most urban areas of Vietnam, although remote and mountainous areas may have limited network coverage. Ensure you have global roaming activated with your mobile carrier before you leave home if you wish to use your mobile while in Vietnam.
Buying a SIM card in Vietnam
To avoid roaming charges, it is possible to buy a local SIM card in Vietnam. Local SIM cards can be used on most unlocked phones from Europe, Asia and Australia and some unlocked phones from North America.
The three largest Vietnamese phone providers - Viettel, MobiFone and Vinaphone - account for 90% of Vietnam’s mobile phones and have booths at the Ho Chi Minh City and Hanoi airports. Viettel’s SIM cards will also work in bordering countries, Cambodia and Laos. Call and data costs are extremely cheap by international standards. Data costs in December 2017 were about 300Mb per US$1, but can vary.
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