Disaster! The worst phone experience I have ever had. BUYER BEWARE. I activated my sim, ported my number and 24 hrs later and still 'no network'. I try to contact customer service and I receive a pop up that sim registrations are delayed. I had to travel overseas and sim registration cannot occur if you are out of country! So now I have no working giffgaff sim, and soon my number will be ported to an unregistered sim! There is no phone number to contact customer service, and no one is replying to my emails. This is such a joke. I am now overseas with no functioning mobile number. Not to mention that I have applied for hundreds of jobs so prospective employers cannot contact me.