Many other people have been posting similar problems on here.
I have tried everything they suggested (except for replacing the ribbon) & nothing worked.
Please read my post before replying, if you type the same suggestions that are elsewhere on this site then it will not work.
I know this as I have tried them already.
I have an Archos G9 80 & the 3G stick to go with it. Both are about 10 days old.
I tried to add my Giffgaff sim to it and connect to the network.
I tried adding credit and adding a data bag to the sim.
I waited for it to be registered.
There were no APN settings on the device.
So I tried to enter the settings from the Giffgaff website manually.
This saved the first time, but I made a mistake when typing the info.
I didn't know how to change it, so I clicked on "Reset to default" (the only other option on the APN menu).
Since then I couldn't save anything.
I think it could be a bug with ICS that once you click on the "Reset" option you cannot manually enter another APN setting.
Archos said this should not cause a problem.
Then they said to reset the data on the device -in effect to wipe the hardrive.
I did this, it makes no difference.
ICS does not allow 3rd party apps to change the APN settings. So none of those APN apps will work.
This is because they do not have root access.
Some websites post details of how to put the APN apps into the root directory.
I do not understand those instructions, so I cannot do this.
It would apparently void all warranty anyway so it can't be the only option.
I have been so close to just smashing the whole thing into tiny pieces and giving up.
It has taken me hours of wasted effort.
Please, please, please can someone with real knowledge help me?
p.s. I have also posted this on the Giffgaff website and people have tried really hard to help me. But no luck yet