Wi-Fi internet services are not fast and have a lower reliability. User of Wi-Fi internet should consider a dualwan router and subscribe to a landline internet as backup. This will reduce your internet downtime.
On the other hand, Wi-Fi Internet is also a great option for person who already has a landline and wants more internet uptime. While Wi-Fi may have a lower reliability than landline, but it has a lower cost per month. Your network will see increase in bandwidth, and you only need the Wi-Fi as a backup when your landline is down. Or you can load balance your traffic through the Wi-Fi.
Wi-Fi reliability depends largely on the signal strength. A high-power Wi-Fi Modem will be able eliminate dropping connections due to low signal strength. PePWave manufacture a High-Power directional Wi-Fi Modem called Surf-DX and you can connects to a distant access point. Pair with a good dualwan router such as PePLink and add to your existing landline internet. This is the ultimate consumer dual wan solution for an always on internet.