From my understanding, you get a base plate that costs $130. From there you have to get the snap-in adapter for the specific phone you have ranging from $100-$145. This system allows you to charge your phone while utilizing the e90s dorsal fin to get better reception. Currently, these are the available snap-in adapters for BMW (don't know if they will carry over to the e90):
-Motorolla V710
-Nokia 6310, 6310i
-Siemens S55
-Sony Ericsson T39
-Sony Ericsson T68i
-Sony Ericsson T610, T616, T630, T637
-Motorola V505, V551, V525, V600, V620, V635
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