WCF and Oracle as BackEnd for Wp7

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WCF

Silverlight

Oracle

database

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Hi Everyone,
I am developing a WP7 app that will be connecting to an Oracle DataBase through a WCF web service. The database was originally in SQL Server but the client is moving to Oracle 64 bit now. The DB aspect has been designed with major operation handled with Store Procedure. I have used Entity Framework (am new to it) to test run a subset of the project with the SQL Server version and I can easily retrieve data (like Magic !!!) I have the following issues:

1.)
How can I use EF with oracle, Oracle's solution is 32-bit, and I don't have enough time to learn nHibernate ? Is there a fast solution to handle the ORM and Serialisation issues? just like EF does for me.

2.)
How can I easily update my DataBase from WP7 through my WCF which uses SOAP

3.)
What other option is there in WP7 apart from XML serialisation. I have used this in a map project but I feel there should be a better way.

Please help me out.