Howdy,
After a bit of a palaver trying to set up my O2 Pocket Hotspot (WiFi Dongle) with GiffGaff, I thought I’d put together an idiot-proof guide for others here, as I didn’t find the process too obvious, if truth be told.
It’s worth noting that there are other general guides already in the GiffGaff community, but I didn’t find that they were too relevant to my specific experience...though I did find them useful for gleaning some of the settings information.
So without further ado, here's exactly what you need to do to get GiffGaff going on your O2 Pocket Hotspot.
In the beginning...
When you get your GiffGaff SIM card, you’ll need to activate it as normal, and get yourself a Gigabag.
Now, because the O2 Pocket Hotspot is configured for O2, you’ll need to tweak a few settings on your device so that it works with GiffGaff.
Changing the settings
So, once you’ve inserted your new GiffGaff SIM into your O2 Pocket Hotspot, you’ll have to plug it in to the USB slot on your computer, and turn your Dongle on. You should be prompted to run a piece of software called O2 Mobile WiFI, that looks a little something like this.
You’ll have to run the programme, and then you’ll be taken to the O2 Mobile WiFi log-in page (http://o2.mobilewifi/login.asp).
Now, ignore all the bright lights on the page, and cast your eye to the bottom right, to the ‘Advanced’ option. You’ll have to enter a password in here, which should be ‘admin’, but check the little card that came with your dongle and see what it says next to “Advanced Settings Password”.
Once in, you'll see this screen:
Now, click on 'Settings' (ignore 'Quick Settings'), and highlight the first option, which is '3G', and you'll see this screen. There are 3 tabs here, 'Wireless Info', 'Network Select' and 'APN Setting'. You want to click on the latter...'APN Setting'.
Now, in the image above, it already has all the GiffGaff information in, that's because I've already done it for this. But when you first log-in here, it'll have a load of O2-related settings. You don't actually want to delete the settings that are already in there, instead, you want to add a new profile.
At the bottom right of the screen (cut off in the image above), you'll se this:
Click on 'Add' , and you'll be prompted to start a new profile, which you'll call 'GiffGaff'.
Now, go to the profile selection 'Drop-Down' box, and you'll still see the old O2 account, AND the new GiffGaff one. Select 'GiffGaff', and you'll now have some blank boxes you'll need to complete. The settings should be:
Profile Name: GiffGaff
APN: GiffGaff.com
DNA: Auto DNS
Authentication: PAP (other guides in the GiffGaff community suggest it should be CHAP, but I accidentally selected PAP, and it works fine)
Username: GiffGaff
Password: password
And that's almost it. But DO CLICK the 'Set as Default' button at the bottom right of your screen to complete things.
Now, it may take a minute or so for the Dongle to take the settings, I found that it didn't kick-in immediately. But once you've come out of the O2 WiFi screen, it may be worth your while turning your Dongle off and on again...I have no real reason for suggesting this, other than that's what I did and it seemed to action the new settings (though it likely was a coincidence and the settings were going to be actioned anyway.)
That's it. Happy dongling.
Having spent the last 2 hours trying to get a giffgaff sim working in the ZTE MF60 pocket hotspot I would like to add some extra information in case anyone comes across this thread in the future.
When the software is installed it didn't go directly to the website, Chrome reported it as can't be found.
The only option I had was to connect to 192.168.0.1with the O2 sim active in the hotspot.
You can add the new APN as described, and the settings are correct, but you can't SET AS DEFAULT while you are connected via the hotspot with the O2 sim active
There are a couple of steps needed in between as described in this article
... and don't forget to switch your WAN back to automatic
All sorted now, gigabag bought and all up and running 
