I've been with Vodafone since October 2015. It was a new line and I also have a line from Plusnet. I've not had any issues at all, I get about the fastest speed I'm possibly going to get without FTTP and the connection has been rock solid. I use their router (no choice in the matter at the moment) and it's absolutely fine, at least as good as the BT HH5 and probably better performing.
I have used the app but in my case it's not overly useful. Will be interesting to see what they do with it in future. I have used it to change Wi-Fi password but I'm so used to using web GUIs that I just use that.
You can set your own DNS, DynDNS, Wi-Fi schedule. All the line stats are there as well as comprehensive logs.
I have Vodafone mobile accounts so I get £5 off my fixed broadband. I did some work for Vodafone in the past but I'm paying for the service and happy to do so.
Customer service desk was a bit ropy at first but to be honest I've not had need to call on them and I know that their advisors are a lot more experienced now. My early problems were caused by incorrect advise from a retail shop which again is probably fine now that we are several months in from launch.
Would happily recommend to anyone.
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