Views: 520 How do I Activate my SIM? | GiffGaff : giffgaff.com/activate SIM Easy peasy. Just pop over to giffgaff.com/activate Most SIM activations take a few minutes. But it can take a bit longer sometimes. Even up to 24 hours in … Continue reading How do I activate my SIM? | GiffGaff : giffgaff.com/activate SIM