Asus 4G-AC55U User Manual page 16

for PPPoE, PPTP, and L2TP
You need to key in the account name and password that you
obtained from your ISP for Internet connection.
for Static IP
You need to manually configure the IP address.
6. If a 3G/4G network is connected, the wireless router's Quick
Internet Setup (QIS) feature automatically detects and applies
the APN setting to connect to the wireless base station. If the
QIS wizard failed to automatically apply the APN setting or
the SIM card prompts for a PIN code, set up the APN setting
manually.
NOTE: The PIN code may vary from different providers.
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