gjstephens76 Freezing, can you help? I’m trying to set it up with the tplink router and having major problems. I’ve activated the Sim and have set up the router and whilst I do have a connection between the device and the router, there’s no internet. Can you help?
You probably need to set up the APN settings in the router to work with giffgaff. See this guide:
As to how you do that, I'm not familiar with tp-link devices as such, but in general, you need to connect to the router from a laptop or other device with a web browser, then use that login to the router's admin page, usually at https://192.168.0.1. The username and password should be in the router manual, or even on a label stuck on the back, but "admin" and "admin" are not uncommon (you may want to change at leat the password). Then find the APN settings, sometimes called "Connection Profiles", and enter the settings given on the giffgaff page linked above.
If you need more detailed help, I'm sure that freezing77 will be able to hep - you can flag a post for their attention by using the Reply link at the bottom of one of their posts.
Good luck and stay well!