Giffgaff a truely awful service my advice give them a miss.
Have had this service for a couple of months. First issues were of course trying to set up my phone. God help anyone that's not technically minded. No person to person support. All done online and feels like your communicating with a computer. Totally infuriating. No service at present, no idea why. It just does not surprise me. Beware the positive comments on this page particularly those individuals posting negative remarks about reviewers who post negative comments. Giffgaff employees ?. Wouldnt surprise me in the slightest. Try Tesco or Asda if you want really cheap rates or one of the more established providers if you want a good service but take my word give this lot a miss.