True, they're technically ahead with the FTTH. But if you have their DSL and don't want them to do works in your house to install their FTTH cables and devices which aren't compatible with any other provider, so that if you are unhappy you have to do works again to change ISP, then you're stuck with at most 1 GB of data per month on mobile. FTTH customers have 2 GB but they won't give DSL customers the 2 GB, not even the option to pay for it, because you know, it's obvious that I need to install FTTH in my home if I want my mobile phone to be able to handle such a bandwidth! This tends to be their policy most of the time: if you don't buy their latest and greatest they screw you by not giving you any updates until they convince you to do so (with a long-term contract of course). Oh, and unacknowledge but obvious caps on various direct download websites, P2P, etc. which I guess would go away if I bought their latest and greatest too.

I'm currently with them because my preferred cable provider (R) didn't have coverage in my building a year ago, but now they do have coverage, so I'm probably saying bye-bye to Telefonica soon. Yes, the service is now technically good, even probably the best (FTTH), but who cares if all their policies (the above is just an example but there are lots more) are set to nickel-and-dime the customers, and to sell more and more and more. You can't even do a technical service call without them spamming you and trying to sell you stuff. R doesn't have FTTH but has a much, much better customer service (including automatic improvements in the bandwidth for time to time, without even asking).