In order to switch access points, you will need a system to control the access point in order to have the seamless hand-off. This is something that the phones have no control over since they are “dumb devices.”

The AP controllers exist, however, due to costs, we have yet to bring a line on.

Have you tried out DECT?

Here are my needs for the device, in my order of priority.
1) it has to stay connected, or at the least re-connect within a few seconds (eg. 15-45) if it does get disconnected.
2) It needs to be able to switch access points on the fly. Even in the middle of a conversation.
3) It needs to be physically robust. Picture a mechanic working on a car, and the thing slides out of his pocket, and he steps on it before he notices it. It should still work. or picture the dish washer working in a restaurant. The phone slides out of her pocket into the hot sudsy water. She sets it aside until it is dry, turns it on, and it still works.
4) It needs a working headphone/earpiece jack that can use commonly available — or at least readily available phone ear pieces.
5) It needs to have a web browser so that even if the only access point available requires web authentication, it will still be usable.

Features that would be nice, would add value to the phone, but are not absolutely necessary. This is in no particular order.

1) flip phone
2) built in utilities such as — calculator, contact manager, todo list, alarm clock, calendar, etc.
3) media player — eg. mp3 player and maybe a movie player
4) camera
5) samba (windows CIFS/SMB) client to transfer files to/from the phone over the network.
6) make the phone a USB client.
7) bluetooth capability.

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