Cache not reloading when list contains unsaved entities

// User 1 queries for contact Kelli Smith and looks up her work phone number.

Contact contact = _manager.Contacts.Where(c => c.Person.LastName == "Smith" && c.Person.FirstName == "Kelli").Single();

Phone workPhone = contact.Phones.Where(p => p.PhoneType.Name ==PhoneType.StandardPhoneNames.Work).FirstOrDefault();

Phone newPhone = null;
if (null == workPhone)
{

    // Kelli Smith has no work phone, so create one, but do not yet save.
    newPhone = Phone.Create(PhoneType.StandardPhoneNames.Work, _manager);
    newPhone.Number = "000";
    contact.Phones.Add(newPhone);
}

 // Meanwhile, User 2 saves a work phone number for Kelli Smith.

 // User 1 wants to refresh phone numbers for Kelli, so force cache to reload.

var f = contact.EntityAspect.GetNavigationProperty("Phones");

f.GetEntityReference(contact).IsLoaded = false;
f.GetEntityReference(contact).Load(MergeStrategy.OverwriteChanges);
workPhone = contact.Phones.Where(p => p.PhoneType.Name == PhoneType.StandardPhoneNames.Work).FirstOrDefault();

// Despite attempting to clear the cache and reload, workPhone at this point is still the
// phone number created (but not saved) above.

// Discard the created but unsaved phone number...
newPhone.EntityAspect.RejectChanges();

// ...and our navigation property now returns the phone number created and saved by User 2, as desired.
workPhone = contact.Phones.Where(p => p.PhoneType.Name == PhoneType.StandardPhoneNames.Work).FirstOrDefault();

 Is this the designed behavior?  It so, how can I refresh a navigation property query without having to manually discard unsaved navigation list members?

Thanks.