Plan Code: VTT-CallViettel is owned by the Ministry of Defence and thus the Vietnamese army. It's the market leader in Vietnam with about 40% of all customers on its network and should be your first choice when you are going to rural areas.
Plan Code: MB-DP100Mobifone is the 3rd provider in the country with a 18% market share. It's in the process of privatisation. Speeds and coverage may be good in the centers and around the coast, but can be patchy in the mountains. This package can be used either Wifi router or cell phone.
Plan Code: VTT-Mimax90
Plan Code: MB-C90
Plan Code: VN-VD89P
Plan Code: VTT-V90