Your device should automatically connect to the internet when you insert an activated Belong SIM. If it doesn't, use the following settings to connect to the network.

Android – combined data and MMS
The configuration screen for Android devices is usually located in the ‘Applications/settings/Mobile Network/Access point name’ sub menu. Please input the following settings to configure the device:

APN: mdata.net.au
Proxy: (blank)
Port: (blank)
Username: (blank)
Password: (blank)
Server: (blank)
MMSC: http://mmsc.mdata.net.au:8003
MMS proxy: 10.1.1.180
MMS port: 80
MMS Protocol: WAP 2.0
MCC: 505
MNC: 01
Authentication: (blank)
APN type (internet): default,dun,supl, mms

Windows
Devices using the Windows phone operating system may require manual configuration. You may be required to perform multiple steps to get this working – the example for a WinPhone 7.5 device is given below. You should refer to the handset manual in each case.

From the front screen, go to the /settings/mobile network/’edit apn’ button
Under APN field, enter: mdata.net.au
Once the previous two steps are complete, the end user should be able to browse the internet.
Set up the device (as per the user manual), including creating a new or applying an existing ‘windows live’ account by following the steps as prompted by the handset.
Check their SMS settings via the /messaging/settings screen. If the SMSC number is not present, the end user must enter it manually (+61 418 706 275). Refer to device manual.
Download the ‘Network Setup’ app from the Microsoft Marketplace (this app may be called a Connection Setup, Network Profile or other name depending on the brand of the handset). Click on the ‘Marketplace’ icon, search for the ‘Network Setup’ app (or the relevantly named app) and download it.
Once downloaded, execute the application. The app will perform a search and come up with the setting for ‘Telstra’ (because Belong mobile uses part of Telstra’s mobile network)
Hit the ‘+’ symbol to add a new APN setting
A table will appear. Fill out the ‘connection name’ field with any desired name (one that can be easily identified – refer to device manual for any limitations on length of name).
Select the tickbox ‘make this my current APN’
For both the Internet and MMS APNs, fill out the data as in the table below (items marked (blank) do not need to be filled in)
Turn the phone off, then turn it back on again for the settings to take effect
Try to send a test MMS to make sure this functionality is working (there are limits to the data size of an MMS on the Telstra Wholesale Mobile Services network and on some handsets).

The following list contains the required Telstra network data settings for a typical WinPhone smart phone.

APN: mdata.net.au
Proxy: (blank)
Port: (blank)
Username: (blank)
Password: (blank)
Server: (blank)
MMSC: http://mmsc.mdata.net.au
MMS proxy: 10.1.1.180
MMS port: 80
MMS Protocol: WAP 2.0
MCC: 505
MNC: 01
Authentication: (blank)
APN type (internet): default,dun,supl
APN type (MMS): mms

Apple
Apple devices accredited for operation on the Telstra network should be able to access data automatically when you insert an activated SIM. If you wish to manually configure your Apple device, please use the settings below in conjunction with Apple’s instructions for ‘Editing APN settings manually for Apple devices’.

APN: mdata.net.au
Proxy: (blank)
Port: (blank)
Username: (blank)
Password: (blank)
Server: (blank)
MCC: 505
MNC: 01
Authentication: (blank)
APN type (internet): default,dun,supl

Support

Device support