My experiment with a cheap Android dual SIM was due to a poor Bluetooth implementation on the device (Mobistel Cynus E1) at the end but next to anything. The device was unreliable reconnecting via Bluetooth after disconnecting.
In the notice the new Nokia dual SIM Lumia 530 got a lot of early praise, so I ventured to try again. Frankly, interested me sometimes the Windows Phone to know 8.1.
The Lumia 530 has dualsim very good value for money.
Everything works reliably - as desired.
The voice quality and battery life is good.
Of course you have the screen at an entry-level phone towards the tip devices make concessions (I have a Nexus 5 is a main unit of the screen already a very different number!). The brightness on the Lumia 530 is pretty good, the picture dynamics, the viewing angle, the color reproduction and black levels, however, are only sufficient. The camera (only on the back) is still better than expected. The material and design are rather than for practicality for style. The device is a little plump but not too heavy. The colorful bowls I find well rather silly! But it is indeed mandatory, a dark gray shell case!
But in particular surprised me the system performance and high ergonomics of the Windows Phone interface.
At this point I'm really excited. Everything is absolutely smooth and self-explanatory.
While I still have problems today, if someone hands me an iPhone or an iPad in hand, I have found my way to the Windows Phone immediately.
Finally, I was also surprised that in the App Store but also quite a lot of the usual Android Apps was available then, so I really have put a lot more functionality to the phone now, as previously intended.
So double surprise: good equipment and good operating system.
Absolute recommendation as beginner or a secondary device!