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Plugs can be C-type or A-type.
Voltage is 220V 50Hz. Make sure to check the voltage of the appliance you are using.
The equipment with the adapter of 100V ~ 240V (such as the iphone) can be used without a transformer.
Internet penetration in the country is high, and many places such as Ha Noi have a lot of cafes and restaurants with free WiFi.