Asus Transformer Pad TF300TG - Manual (Page 4)

ASUS Transformer 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.
Fill in suggested fields APN, MMSC, MMS proxy, MCC, and MNC. The
required fields for APN may vary with your 3G network service provider.
Your ASUS Transformer Pad connects to the Internet through the wireless
access point when WiFi and 3G networks are both available. Disable WiFi
function to access 3G networks.