crowley12345678 did you see if there any issues in your area using the service status checker as per my previous post?
Otherwise please try swapping SIMs with another phone to see if there’s a problem with your phone or the giffgaff SIM.
If it turns out to be a problem with the giffgaff SIM then you should contact the agents for help by submitting this form All services not working
Agents usually reply within 4 hours, but can take up to 24 hours at busy times (but they do work 7 days a week from 8am to 11pm). You will find Agents’ replies in the “Messages: From Agents” box which is half way down the right hand side of your giffgaff dashboard or go here Ask an Agent messages.