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I can't check if ABPerson is assigned to particular group.
I'm using the latest MonoTouch, and can't find: ABPersonCopyParentGroups
You're right this is not in MonoTouch. The function is documented for OSX  but not for iOS .
I'll check if this is a documentation error (and a missing API in MonoTouch) or if it's something not available to iOS developers.
A quick test gives me:
System.EntryPointNotFoundException : ABPersonCopyParentGroups
so it looks like the documentation and header files are right, i.e. this API is not available for iOS.
> I can't check if ABPerson is assigned to particular group.
In this case, since you know the group, using `ABGroup.GetMembers` should work pretty well.
QA: unit test added in
if it ever fails we'll know the API has been added :)
note: I'll be adding the API for monomac so it should be easy to add it to MonoTouch if/when Apple decide to provide the API in iOS.