There was a recent issue using Migration+ to import contacts to HTC One X and HTC One S. Luckily we fixed it and have already published a new version for Android on both Amazon and Google Play. There was a layer of logic HTC put into their customized software on these phones that changed some normal Android API use for the address book (contacts). One of the issue was that we were not getting a normal “Null pointer exception” error if particular fields were blank…instead it was giving other exceptions.
If any of our fellow developers out there are struggling with this one, take two steps
1) Send HTC some feedback for adding (undocumented) customization/restrictions to normal android APIs
2) Send us a mail if you need help solving it