.      Convenient and stress free --- I frequently travel to London every once in 3 months for work and everytime that I travel, I usually use a matrix international sim card.. What I like about their sim card is that its really convenient to just start using that number, sometimes I reuest for the same number and if available I do get it. Their network is excellent there. Once or twice I have had issues with data network which was minor but overall I would rate their services at 9 on a scale of 10. I pay a little extra for convenience and it works for me!! I do recommend matrix sims to my friends as well. And they have had a good feedback too.