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I only offer high speed internet service via WiFi, rather than ethernet cable for several reasons. It can be used throughout the house and it is less likely to have problems than wired which gives them direct physical access (in some cases) to your router.
I too suffer phone problems at my location with AT&T. So I added their MicroCell and offer to enter a guests cell phone into the system for their use while at the house. This gives them strong signal reception in the house, and especially close to the micro-cell. The cost when I did it is a one time fee of $250 but I think AT&T is now offering it for free.
Well the high speed interent with cable is far better and fast than Wi-Fi interent. Wi-Fi net best where we requrire more than two users and they want to use it from their own bed room but Wi-Fi doesn't give as much speed like cable high speed interent.
Unless you have faster service than 100 mbit ethernet coming into your house you won't see any real difference between using ethernet or WiFi. Cable companies charge an arm and a leg for 50 mbit Internet service and some newer WiFi dual channel 5MHz is capable of 400mbit ethernet, way more than the cable company will provide.