Asus Eee Pad Transformer TF101G - Manual (Page 4)

ASUS Eee Pad 
5. Call your mobile service provider, ask for the APN related information
and fill in all the fields needed. Scroll down for more fields.
Generally you need to fill in APN, MMSC, MMS proxy, MCC, and MNC.
The required fields for APN may vary with your 3G network service
provider.
Wireless network has a higher priority. Your Eee Pad will connect to the
Internet through the wireless access point when WiFi and 3G networks
are both available. Disable WiFi function if you would like to surf the web
through 3G networks.