Access instance console from mobile phone

Can you use the AWS Console mobile app to login to your linux instance? NO

The easiest way to do this however is to:

• install an SSH client on your mobile phone from the APP Store
• update the password for the linux user to something very strong - upper/lower char, number and some special characters... you know the drill.
• update the SSH server config to permit password login:

Edit file: /etc/ssh/sshd_config

Locate this line and update as shown: PasswordAuthentication yes

Then restart the SSH server. The way to do this varies on your linux distribution. Google around.

AWS instances are initially configured to only permit SSH key authentication. You could email yourself the private key for the key pair that you have and see if your mobile app can handle it. This varies by vendor.