for Android settings http://bit.ly/t4w0jr
how to giffgaff a Blackberry http://bit.ly/x2luFP
and for iPhone settings http://bit.ly/t2bYoI#faq_no_5
Hi sorry to hear this but Unfortunately Giff Gaff are having few issues at the moment..with Delayed goodybags,top ups and activations so give it a few hour and try again.
Hope this helps and you get it sorted... Have a great Day 🙂
Depending on what phone you have you'll have to reset the setting and type them in manually but if you have android you can connect to wifi and download the giffgaff apn app which will download the settings automatically.