When I got internet from VM (they was NTL then), they ONLY provided a modem, and you the customer provided the Router.
Since 2011 they came up with the SH, its ideal for very basic users. But to get the best out of it, turn it into a MODEM, and buy your own Router.
I have had the SH, beta tested the SH2 / SH2AC.
Then got the SH3, and now SH4, all of them the WIFI has been useless. But since 2011 i have had my own Router, both made by ASUS, and never had an issue with WIFI.
Go MODEM MODE, you can thank me later.
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Red (VM SH2 AC Beta tester)
Running on 1Gbps VM service with SH4 in Modem Mode, with a ASUS RT-AC5300 router. With this setup I get Fantastic WIRED and WIRELESS Signals in my home. I dont work for VM. But I work in IT, and I know my tech.
My advice is at your own risk. If you are happy with my answers please press Kudo ?