As you are using third party components, and the code works for one type of phone but not the others, this would suggest a problem either with the library or with configuration of the library. Your best bet with such a specific query is to post this question in the support forum of the relevant libraries as their support teams will be much better placed to field such a query.
I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be
Forgive your enemies - it messes with their heads
My blog | My articles | MoXAML PowerToys | Onyx