International calls can be made at Coco Cafe (121 Nguyen Dinh Chieu) via the internet. Vietnam’s network (GSM 900/1800) is compatible with most of Asia, Europe and Australia, but not North America. You can buy a local SIM card and talk time for between VND50,000 and VND500,000. The most popular providers are Viettel, Vinaphone and Mobiphone. 3G coverage is now available in major towns and cities.