A free, no-signup calendar tool for giffgaff users. Officially, a giffgaff number can enter deactivation after 6 consecutive months without a listed qualifying activity (such as a call or SMS to another number, using mobile data, or buying credit or a plan). Enter the date of your last qualifying activity and the tool creates a fifth-month buffer reminder as a standard .ics file for Apple, Google and Outlook calendars. All calculation happens in your browser; nothing is uploaded. The fifth-month date is this site's own buffer, not an official rule change. Independent tool, not affiliated with giffgaff, and it does not guarantee number status. The site also promotes the maker's own SIM sales.
giffgaff users can lose their number after 6 months of inactivity, so I built a simple private calendar reminder that runs entirely in the browser.