I'm traveling to the UK and wanted to see how easy it would be to get an international sim card for my iphone 6s. I still need to unlock my iphone 6s (which I've had for over 1 year) so I hope that won't be a problem. But before I try to go down this path I wanted to check if anyone has had success doing this. If so, what were the steps? What international sim cards worked? What sim cards to avoid?