Dial code
+84
To call Vietnam from Philippines, dial + or 00 (exit code for Philippines), then 84 (the country code for Vietnam), then the area code (without the initial 0) and the local number.
Calling from Philippines
+ 84 210 1234567
00 84 210 1234567
Local call
0210 1234567
For local calls within Vietnam, start with the area code (with the initial 0). In the case above area code is 210 .