How To Call Vietnam From US
Quick Reference Summary
To call Vietnam from the United States:
011 + 84 + Area Code + Local Number
Examples:
- For Hanoi landline: 011 + 84 + 24 + XXXXXXX (7 digits)
- For Ho Chi Minh City landline: 011 + 84 + 28 + XXXXXXX (7 digits)
- For Vietnam mobile phone: 011 + 84 + 9X + XXXXXXX (7 digits)
When it’s 12 PM (noon) in New York (EST), it’s 12 AM midnight in Vietnam (12 hours ahead).
How to Call a Landline in Vietnam
To call a Vietnam landline from the United States, follow these steps:
- Dial the US exit code: 011
- Dial Vietnam’s country code: 84
- Dial the area code (without the leading zero)
- Dial the local phone number (usually 7 digits)
For example, if you’re calling a Hanoi number that would be written as 024 3456 7890 in Vietnam, you would dial 011 84 24 3456 7890 from the United States.
It’s important to note that when dialing internationally, you need to drop the leading zero from the Vietnamese area code. So if the number in Vietnam starts with 024, you would dial just 24 after the country code.
How to Call a Mobile Phone in Vietnam
Calling a Vietnamese mobile phone follows the same pattern with some differences:
- Dial the US exit code: 011
- Dial Vietnam’s country code: 84
- Dial the mobile prefix (without the leading zero)
- Dial the rest of the mobile number (usually 7 digits)
For example, if the Vietnam mobile number is 090 123 4567, you would dial 011 84 90 123 4567 from the US.
Vietnamese mobile numbers typically begin with 09, 03, 07, or 08 followed by 8 more digits. Remember to drop the leading zero when dialing from the US.
Understanding Vietnam Phone Numbers
Vietnam’s phone numbering system underwent significant changes in 2018, so it’s important to understand the current format for successful international dialing.
Landline Numbers
Vietnam landline numbers consist of:
- An area code (2 digits preceded by a zero when dialed within Vietnam)
- A 7-digit local number
Total digits: 10 (including area code with zero) when dialed within Vietnam; 9 digits when dialed internationally
Mobile Numbers
Vietnamese mobile numbers have:
- A provider prefix (2 digits starting with 0)
- An 8-digit personal number
Total digits: 10 when dialed within Vietnam; 9 digits when dialed internationally (after dropping the leading zero)
Vietnam Area Codes
Vietnam’s area codes were updated in 2018. When calling Vietnam from the US, remember to dial 011 + 84 + area code (without the leading 0) + local number.
| City/Region | Area Code |
|---|---|
| Hanoi | 24 |
| Ho Chi Minh City | 28 |
| Hai Phong | 225 |
| Da Nang | 236 |
| Hue | 234 |
| Can Tho | 292 |
| An Giang | 296 |
| Ba Ria-Vung Tau | 254 |
| Bac Giang | 204 |
| Bac Kan | 209 |
| Bac Lieu | 291 |
| Bac Ninh | 222 |
| Ben Tre | 275 |
| Binh Dinh | 256 |
| Binh Duong | 274 |
| Binh Phuoc | 271 |
| Binh Thuan | 252 |
| Ca Mau | 290 |
| Cao Bang | 206 |
| Dak Lak | 262 |
| Dak Nong | 261 |
| Dien Bien | 215 |
| Dong Nai | 251 |
| Dong Thap | 277 |
| Gia Lai | 269 |
| Ha Giang | 219 |
| Ha Nam | 226 |
| Ha Tinh | 239 |
| Hai Duong | 220 |
| Hau Giang | 293 |
| Hoa Binh | 218 |
| Hung Yen | 221 |
| Khanh Hoa | 258 |
| Kien Giang | 297 |
| Kon Tum | 260 |
| Lai Chau | 213 |
| Lam Dong | 263 |
| Lang Son | 205 |
| Lao Cai | 214 |
| Long An | 272 |
| Nam Dinh | 228 |
| Nghe An | 238 |
| Ninh Binh | 229 |
| Ninh Thuan | 259 |
| Phu Tho | 210 |
| Phu Yen | 257 |
| Quang Binh | 232 |
| Quang Nam | 235 |
| Quang Ngai | 255 |
| Quang Ninh | 203 |
| Quang Tri | 233 |
| Soc Trang | 299 |
| Son La | 212 |
| Tay Ninh | 276 |
| Thai Binh | 227 |
| Thai Nguyen | 208 |
| Thanh Hoa | 237 |
| Thua Thien Hue | 234 |
| Tien Giang | 273 |
| Tra Vinh | 294 |
| Tuyen Quang | 207 |
| Vinh Long | 270 |
| Vinh Phuc | 211 |
| Yen Bai | 216 |
Mobile Phone Networks
Vietnamese mobile numbers can be identified by their prefix. When calling from the US, remember to drop the leading zero:
| Network | Prefixes |
|---|---|
| Viettel | 32, 33, 34, 35, 36, 37, 38, 39, 86, 96, 97, 98 |
| Vinaphone | 41, 42, 43, 44, 45, 47, 48, 49, 81, 82, 83, 84, 85, 88, 91, 94 |
| Mobifone | 50, 51, 52, 53, 54, 55, 56, 58, 59, 70, 76, 77, 78, 79, 89, 90, 93 |
| Vietnamobile | 56, 58, 92 |
| Gmobile/Beeline | 59, 99 |
| Indochina Telecom (iTelecom) | 87 |
When calling a Vietnamese mobile from the US, dial 011 84 followed by the prefix (without the leading zero) and the remaining digits.
Time Difference
Vietnam follows Indochina Time (ICT), which is UTC+7 all year round. Vietnam does not observe Daylight Saving Time.
The time difference between the US and Vietnam depends on your location in the US and the time of year:
- Eastern Time (ET): Vietnam is 12 hours ahead (winter) or 11 hours ahead (summer)
- Central Time (CT): Vietnam is 13 hours ahead (winter) or 12 hours ahead (summer)
- Mountain Time (MT): Vietnam is 14 hours ahead (winter) or 13 hours ahead (summer)
- Pacific Time (PT): Vietnam is 15 hours ahead (winter) or 14 hours ahead (summer)
Vietnam’s Phone System
Vietnam has rapidly modernized its telecommunications infrastructure in recent years:
- Most urban areas have excellent coverage
- Landlines are common in businesses but less so in homes
- Mobile phones are extremely popular throughout the country
- 4G service is widely available in urban areas
- Many Vietnamese use messaging apps like Zalo (Vietnam’s popular chat app), WhatsApp, and Facebook Messenger
Best Times to Call
Given the significant time difference, planning your calls to Vietnam requires some thought:
- Vietnam business hours: 8 AM to 5 PM (Vietnam time), Monday through Friday
- When it’s evening in the US (7 PM – 10 PM ET), it’s morning in Vietnam (7 AM – 10 AM)
- When it’s morning in the US (7 AM – 10 AM ET), it’s evening in Vietnam (7 PM – 10 PM)
The best times to call businesses in Vietnam from the US East Coast would be:
- Evenings in the US (Vietnam morning): 7 PM – 10 PM ET
- Early mornings in the US (Vietnam evening): 6 AM – 8 AM ET
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