My opinion as a giffgaff user
Just signed up with giffgaff, I think it's great that you can call and txt other giffgaff users for free!! Get free internet and you can top up £5 which is usefull when your not so flush. It's also great that you can call internationally for just 8p per min!! Love it. If anyone else is interested in trying it out I have included a link below to get a free sim and i think you get £5 free credit with it too, and you can keep your number if you don't want to change it!