I don't think you understand the problem. It's not your phone, it's not Yappari. It's your WhatsApp account. If you ask me, I think it looks like they are blocking you the ability to upload. Maybe you have been sending copyrighted stuff like mp3s and movies (and you can't do that). Try getting a different phone number and registering a new account, even if it only to test. I'll bet you don't run into upload problems. And don't send copyrighted stuff. Just your personal audio, pictures and videos.