annotation disappeared

Do viewers of my videos see the annotations on them if they are watching my videos on a phone or ipad or something similar? I thought they did but I just told my friend who I'm sitting with to watch one of my video and he done it using his phone and I noticed there was no "Subscribe" annotations...

I can't find this in forums or help. I've noticed my annotations keep disappearing when I add them to newly uploaded videos. This has been going on for the longest time and I can't figure out the problem. I noticed it happens when I add annotations to a fresh video I just uploaded. The...