even if application for myetherwallet is exist i doubt that i will use it. i am afraid that cellphones can be hacked. do not know how about now but earlier mobile security was weaker.
Not that cellphone is prone to hacking but instead any smartphone is really easy to be lost. I just don't have the urge to save any wallet on my phones, however if people like it there's nothing wrong with that, since privkey will be at your own hand to protect or probably encrypt.
Oh it will be very cool if we had a mew wallet mobile app. I think it will be very useful, because personal computer have less level of safety.
Actually, mobile phone virus has grown significantly although most of them are just ads and popups malware so basically the same as saving on personal computer but personal computer could be secured furthermore and if you want the fullest security it's always personal computer with hardware wallet