The major cell phone carriers are: Mobile Phone, Vina Phone, Viettel, S-Phone, E-Telephone. Vina Phone and Viettel is the best service provider with large coverage throughout Vietnam with the best quality. You can purchase a SIM card in many stores, and buy time at even more. Prices vary.

Tip: You must have your phone unlocked before an international (Vietnam) SIM card will work in your phone. If you have gotten a phone on contract with your local provider at home, chances are your phone will not be unlocked. 

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Do people still speak French in Vietnam?