Viettel is a Vietnamese cellphone service provider based in Hanoi. The company was launched in 2004 and is now the largest cell service provider in the country. To dial internationally on your Viettel cellphone you must first enter the international dialing code (00), followed by the country code and the telephone number.
Dial "00" on your cellphone. This is the code to begin an international call.
Dial the country code. This one-, two- or three-digit code connects the call to a particular country. See Resources for help finding the country code you need. The country code for the United States is "1."
Dial the full phone number with the area code.
Tips & Warnings
- Make sure you understand the costs involved by calling internationally with Viettel. Most phone networks charge considerably more to call internationally, but many offer special packages to customers who sign up for the service in advance.
- Photo Credit Jacqueline Veissid/Digital Vision/Getty Images
How to Install a New SIM Card
In order to install a new SIM card into a cell phone, the battery pack must first be removed before gently removing...