Can't setup wifi calling

Do you mean a microcell?  Which is not the same as wifi calling.

This is a question for @OttoPylot. 

If you are referring to the MicroCell a rurual address or p.o. box will not work because of the E911 FCC requirements. The GPS coordinates sent by the MicroCell must match what is in the locational database before registration will complete. Some rural customers have had to go to their local Emergency Services to find out what they have in their address base as their location for E911 calls and then attmpet to use those coordinates.

If you are referring to WiFi Calling (WiFi-C) that has nothing to do with the MicroCell and is totally dependent on your internet service and the type of phone you have. Presently, WiFi-C is only available for the iPhone 6 and above on the AT&T network. If you have a satellite or wireless broadband internet provider I don't know if WiFi-C has been shown to work reliably. The MicroCell, on the other hand, is designed for land-based internet service only (cable/DSL) and is not supported by AT&T for satellite or wireless broadband.

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@caserat wrote:
No, I don't even know what microcell is. I am trying to use the wifi calling feature on my iPhone 6.

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What kind of internet service do you have and what are the speeds? WiFi-C is dependent on the quality of your WiFi signal.

Ok. Just checking to make sure you don't have satellite/wireless broadband.

Have you turned off completely and then turned back on your iPhone 6? Does Google Maps/Apple Maps indicate  your correct location? I can't see why your physical address would matter for connecting via WiFi-C. If anything, your Maps location would be off. It could be that your area is not yet provisioned for WiFi-C.

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@caserat wrote:

My problem is before it even tries connecting, it won't accept the W before number

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I'm confused. Why do you need to use your address to make a call? Just dial 1-area code-number.

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@caserat wrote:
I'll walk you through it. I toggle wifi calling in services. It pops up a thing to approve terms. Then it goes to a page with address and that's where I get stopped. I can't make a wifi call without a good address. It's att that must have it set up so you can't use a letter in front of the numbers.
Yes, if I put my address in Google maps or any gps device, with the W in front, it pops up my house.

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I just turned on wifi calling myself so I know what you are talking about but can't offer any suggestion as to why it won't accept the W. Have you tried removing the W and see if that works?