Mutibit HD - Maintain a wallet on 2 devices
Yes with an HD wallet you can use as many devices as you like.

However you may want to ask yourself why you are doing this. More devices = more possible attack surfaces.

Using different HD wallets has the benefit of the losing one (to a keylogger, etc) not causing loss to your Bitcoin in the others.

Why not keep a small amount of BTC in your mobile HD wallet for everyday use and have a little more in a seperate laptop HD wallet and the majority in a seperate cold storage HD wallet?