Setup manually Plateau APN Settings for your device. This is Plateau 4G+ APN Settings which is updated.

Plateau Wireless APN Settings for Android iPhone Updated
Plateau Wireless APN Settings for Android iPhone Updated

How to setup Plateau APN Settings for Android?
In your Android mobile/Tab Go to Settings > More >Cellular/MObile Network > Access point Names > + ( to add)

Plateau APN Settings for Android

Name : PLATWEB
APN : isp.plateau
Proxy : Not Set
Port : Not Set
Username : Not Set
Password : Not Set
Server : Not Set
mmsc : Not Set
mmsproxy : Not Set
mmsport : Not Set
MCC : 310
MNC : 100
Authentication Type : Not Set
APN type : Internet

Plateau MMS APN

Name : PLATMMS
APN : mms.plateau
Proxy : Not Set
Port : Not Set
Username : Not Set
Password : Not Set
Server : Not Set
mmsc : http://mms
mmsproxy : 172.23.253.206
mmsport : 8080
MCC : 310
MNC : 100
Authentication Type : Not Set
APN type : mms

How to setup Plateau APN Settings for iPhone or iPad?
In your iPhone mobile go to Settings> Cellular> Cellular Data Network> APN and fillup the following information.

Plateau APN Settings for iPhone iPad

Cellular Data:
APN: isp.plateau
Username: Blank
Password: Blank
MMS:
APN: mms.plateau
Username: blank
Password: blank
MMSC: http://mms
MMS Proxy: 172.23.253.206:8080
MMS Message Size: 524288
MMS UA Prof URL: blank