TP-Link TL-MR3420 User Manual page 18

3G/4G Only

In this mode, the Router will try 3G/4G access only. WAN access is disabled.
3G/4G Preferred

In this mode, the Router will try 3G/4G access first. If 3G/4G access fails and WAN
access is valid, or if no 3G/4G USB modem is inserted, the Router would switch to WAN
access. Once the Router succeeds to connect to the 3G/4G network, the Router would
stop the WAN connection and switch back to 3G/4G access immediately.
WAN Preferred

In this mode, the Router will try WAN access first. If the WAN access fails and 3G/4G
access is valid, the Router would switch to 3G/4G access. Once the Router succeeds to
connect to the WAN network, the Router would stop the 3G/4G connection and switch
back to WAN access immediately.
WAN Only

In this mode, the Router will try WAN access only. 3G/4G access is disabled.
4. The next screen will appear as shown in Figure 3-5. You need to set the required
parameters and then click Next.
TL-MR3420
Figure 3-4 Choose Internet Access Mode
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3G/4G Wireless N Router User Guide