I picked up an EE (UK telecoms provider) SIM card after returning to Britain after many years abroad. Buying credits in a shop is a hassle - and hampered by my poor memory when shopping - so I decided to do it online. However, when I visited the EE site and tried to plug in my phone number and other details, I was rejected because my email address had already been registered. As it happens, I had had an EE subscription phone plan at some point before my travels. I can't remember what that phone number was, and I certainly no longer have the EE site credentials anywhere. It has not been possible for me to resolve this. Well, I could use another email address, but I've decided not to do so. There is probably an advantage in a telecom provider not having info such as name, physical address, email address etc.