If only I had read some reviews before purchasing a sim card and data bundle from Lycamobile at Heathrow 3 days ago. I could not activate it and was locked out of customer help because my balance was supposedly £0, despite having paid £25 two hours earlier. Trying to "register" I finally reached an advisor who could not help me at all but assured me that he would register me and that someone would call me back within 24 about my internet access. No call, no access. When I called back I was told electronically that my complaint had been closed. When I tried to relodge I was told the same. Now I see that so many other customers have had similar problems with Lycamobile's non-functioning product. But even worse is their unspeakable customer service, the most appalling I've experienced in nearly 20 years of using mobile services across the world.