Dell SonicPoint automatically moving accross devices

I have 4 sonicpoints set up in my office, all connecting to an NSA 2600.

All 4 have the same SSID and same band / channel.

On a laptop i can connect to one and walk to the other side of the office without the connection dropping for more than a couple of seconds while it switches between devices.

However on phones i have an issue where sometimes they will use the GPRS data instead of the wifi when moving between devices, sometimes i have to turn the wifi off on the phone and back on before it will use the wifi again.

Is there any way around this? I am getting quite a bit of greif from people in the office over it. Dell wont support it as the sonicpoints werent purchased through them.
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You can vary channels to improve coverage.
Mobile phones just work like that to save power. You cannot fix them all,

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