As above, I'm currently on 10mb and thinking of upgrading to 50mb. Will I need new hardware, or is it just a change of settings at VM's end? Does an engineer have to come out again, or is the switch fairly instant?
Your modem needs to be DOCSIS 3 compatible. This is most of the VM used modems now including (I believe) the Scientific Atlanta / Webstar EPC200 model. Certainly the VM / Ambit modems are ok. If you have one of the old Motorola modems you should give VM a call when booking your upgrade and tell them to make sure the engineer brings a new modem.
Engineer arrives and performs installation
Engineer calls through to VM and gets them to "send hits" to the modem in order to register it.
Reboot modem
online
An engineer is required for 50Mb installations and if you use wireless Internet and already have a "G" rated router, it will need to be changed to an "N" router in order to maximise potential
Your modem needs to be DOCSIS 3 compatible. This is most of the VM used modems now including (I believe) the Scientific Atlanta / Webstar EPC200 model. Certainly the VM / Ambit modems are ok.
There's a single modem in use on the VM network that is DOCSIS 3 compatible, the VMNG 300. None of the other modems are usable for the 50M tier.