Below APN settings should be manually configured in your Nokia Lumia 638 to access internet or MMS with Viettel in Vietnam.
Go to App list, tap Settings Cellular + SIM
If your phone supports more than 1 SIM card, choose SIM 1 settings or SIM 2 settings depending on the SIM that you want to use for Viettel .
Turn on Data Connection.
Enable Use cellular data in For limited Wi-Fi connectivity
If you have more than 1 SIM card choose the SIM card for data connection in SIM for data connection
Enable 3G connection for faster data transfer speeds. Also enable Highest connection speed
Internet Configuration Settings:
In Cellular + SIM Settings, select SIM settings Add Internet APN
If you have a dual SIM phone select the SIM card.
Change the below settings
Proxy server (URL):
IP type: IPv4
|Networks||2G, 3G, 4G LTE|
|Speed||HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps|
|OS||Microsoft Windows Phone 8.1|
|WLAN||Wi-Fi 802.11 b/g/n, DLNA, hotspot|
|CPU||Quad-core 1.2 GHz Cortex-A7|
|Screen||IPS LCD capacitive touchscreen, 16M colors 480 x 854|
|Front camera||N/A MP|
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