Currently using it.

We have used 3 for a long time because the (grown up) kids live in London and they like the coverage there. When it came to end of contracts we found ID had better offers than 3 including the EU roaming still being free and so we moved over and it’s exactly the same and so if you know anyone on 3 then that’s the experience you get.

Not had the need of customer service and so can’t pass content on it but seems most companies use all automated stuff so it’s not something I’m bothered about.