Have bought what's up and installed on my Kindle Fire HD. That worked. But that's about it. No registration, no registration. How I can to contacts who whatsup on their smartphone to access, I could not figure out. It appears only garbage. Two attempts to reach the distributor of this app via contact-mail, remained so far without success. So this app is useless for me and a loss of EUR 0.99. Therefore, only one point. Would rather give three minuses