This document states:
If you need durable state, you can use the durable storage (introduced in .NET 3.5) or implement your own custom solution.
If this is referring to WCF Durable Services here (not durable storage) then this is not so simple to support in the Mobile client since you can't use context-aware bindings OOB. You would have to roll your own client implementation to get this done. I suggest
that if this document is to suggest an implementation, it would be good for readers to know what is supported OOB and what is "roll your own". Otherwise we could be guiding people to think that things are supported as they are for rich clients. Just