It won't work. It's very weird registration doesn't work for you since people have been registering lately using Yappari with no problems. Also IMEI spoofing won't work to use Yappari in two devices at the same time. IMEI spoofing is just to not use your real IMEI, not to spoof another device. Now, IMEI spoofing + android=true might spoof an Android device (and it won't always work). Yappari can't spoof iPhones or any other platform.