Data Solutions for Silverlight/Windows Phone 7

I have an application I'm building for silverlight. I'm also going to build a UI for windows phone 7 too. Both will need to have access to data from a database.

Is there one solution that will work on both platforms? RIA services i开发者_如何学Gos out since it's not yet supported in WP7, but can I use a REST or WCF service approach to service both?

Thanks.

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According to this SO question, WCF on WP7 works fine.