I want to know if TP Link has any 4G Router which supports this way of Internet Connection. By default it should connect to Internet via WAN Port and if there is no Internet Connection or drop , it can automatically connect to 4G Network and start as a backup method. This can also send me a log via email or App based on Tether if the network has been switched to Backup. This will be so much good method if the Internet at important Video Calls or other things it can use 4G Network at the same time. i would really love to see this feature and plus definately people will like this type of Method.