You can access PARE from any internet enabled device, this includes smartphones and tablets. There is no separate mobile app to download for these devices. You just log on to the PARE website as you would from a PC.
Some organisations may have a firewall in place that blocks access to unknown websites. If you think you are experiencing this please contact your local IT department, or the appropriate member within your organisation, so they can take action to ensure you can access the PARE website on their network.