@Bossman
On my main phone (currently Huawei P6) I still cling to Android and would not even consider switching to another OS. I've briefly tested Windows Phone devices before, so my expecations are not too high.
@rfranzq
So far there's the Nokia Lumia 530 Dual SIM and the Nokia Lumia 630 Dual SIM which, according to very recent news, will soon be joined by the Nokia Lumia 730 Dual SIM:
http://www.gsmarena.com/nokia_lumia_...-news-9281.php