To help prioritise responding to help a small red or green dot by the posters name helps indicate if they are still online waiting for a response. If you think this idea will help, you can support it here.
This nifty idea is to add a coverage rating option to the app allowing you to rate the quality of the network where you. This feedback is then given to O2 so improvements are made in the right locations.
An additional option for payback which would be "saving for phone" so that giffgaff users who have earnt payback could save it to buy a phone from the site. If you support this idea click here and give it a some love.